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Zhandun VS, Kazak NV, Kupenko I, Vasiukov DM, Li X, Blackburn E, Ovchinnikov SG. Orthogonal magnetic structures of Fe 4O 5: representation analysis and DFT calculations. Dalton Trans 2024; 53:2242-2251. [PMID: 38193857 DOI: 10.1039/d3dt03437b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
The magnetic and electronic structures of Fe4O5 have been investigated at ambient and high pressures via a combination of representation analysis, density functional theory (DFT+U) calculations, and Mössbauer spectroscopy. A few spin configurations corresponding to the different irreducible representations have been considered. The total-energy calculations reveal that the magnetic ground state of Fe4O5 corresponds to an orthogonal spin order. Depending on the magnetic propagation vector k, two spin-ordered phases with minimal energy differences are realized. The lowest energy magnetic phase is related to k = (0, 0, 0) and is characterized by ferromagnetic ordering of iron magnetic moments at prismatic sites along the b-axis and antiferromagnetic ordering of iron moments at octahedral sites along the c-axis. For the k = (1/2, 0, 0) phase, the moments in the prisms are antiferromagnetically ordered along the b-axis and the moments in the octahedra are still antiferromagnetically ordered along the c-axis. Under high pressure, Fe4O5 exhibits magnetic transitions with the corresponding electronic transitions of the metal-insulator type. At a critical pressure PC ∼ 60 GPa, the Fe ions at the octahedral sites undergo a high-spin to low-spin state crossover with a decrease in the unit-cell volume of ∼4%, while the Fe ions at the prismatic sites remain in the high-spin state up to 130 GPa. This site-dependent magnetic collapse is experimentally observed in the transformation of Mössbauer spectra measured at room temperature and high pressures.
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Affiliation(s)
- Vyacheslav S Zhandun
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia.
| | - Natalia V Kazak
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia.
| | - Ilya Kupenko
- Institut für Mineralogie, University of Münster, Corrensstr. 24, 48149 Münster, Germany
| | - Denis M Vasiukov
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, Box 118, Lund 221 00, Sweden
- Materials Science and Applied Mathematics, Malmö University, Malmö 204 06, Sweden
| | - Xiang Li
- Institut für Mineralogie, University of Münster, Corrensstr. 24, 48149 Münster, Germany
| | - Elizabeth Blackburn
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, Box 118, Lund 221 00, Sweden
| | - Sergei G Ovchinnikov
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia.
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2
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Layek S, Greenberg E, Chariton S, Bykov M, Bykova E, Trots DM, Kurnosov AV, Chuvashova I, Ovsyannikov SV, Leonov I, Rozenberg GK. Verwey-Type Charge Ordering and Site-Selective Mott Transition in Fe 4O 5 under Pressure. J Am Chem Soc 2022; 144:10259-10269. [PMID: 35649281 PMCID: PMC9204770 DOI: 10.1021/jacs.2c00895] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Indexed: 11/28/2022]
Abstract
The metal-insulator transition driven by electronic correlations is one of the most fundamental concepts in condensed matter. In mixed-valence compounds, this transition is often accompanied by charge ordering (CO), resulting in the emergence of complex phases and unusual behaviors. The famous example is the archetypal mixed-valence mineral magnetite, Fe3O4, exhibiting a complex charge-ordering below the Verwey transition, whose nature has been a subject of long-time debates. In our study, using high-resolution X-ray diffraction supplemented by resistance measurements and DFT+DMFT calculations, the electronic, magnetic, and structural properties of recently synthesized mixed-valence Fe4O5 are investigated under pressure to ∼100 GPa. Our calculations, consistent with experiment, reveal that at ambient conditions Fe4O5 is a narrow-gap insulator characterized by the original Verwey-type CO. Under pressure Fe4O5 undergoes a series of electronic and magnetic-state transitions with an unusual compressional behavior above ∼50 GPa. A site-dependent collapse of local magnetic moments is followed by the site-selective insulator-to-metal transition at ∼84 GPa, occurring at the octahedral Fe sites. This phase transition is accompanied by a 2+ to 3+ valence change of the prismatic Fe ions and collapse of CO. We provide a microscopic explanation of the complex charge ordering in Fe4O5 which "unifies" it with the behavior of two archetypal examples of charge- or bond-ordered materials, magnetite and rare-earth nickelates (RNiO3). We find that at low temperatures the Verwey-type CO competes with the "trimeron"/"dimeron" charge ordered states, allowing for pressure/temperature tuning of charge ordering. Summing up the available data, we present the pressure-temperature phase diagram of Fe4O5.
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Affiliation(s)
- Samar Layek
- School
of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv, Israel
- Department
of Physics, School of Engineering, University
of Petroleum and Energy Studies (UPES), Dehradun, Uttarakhand 248007, India
| | - Eran Greenberg
- Center
for Advanced Radiation Sources, University
of Chicago, 5640 South Ellis Avenue, 60637 Chicago, United States
- Applied
Physics Division, Soreq NRC, Yavne, 81800, Israel
| | - Stella Chariton
- Center
for Advanced Radiation Sources, University
of Chicago, 5640 South Ellis Avenue, 60637 Chicago, United States
| | - Maxim Bykov
- Institute
of Inorganic Chemistry, University of Cologne, Greinstrasse 6, 50939 Cologne, Germany
| | - Elena Bykova
- Earth
and
Planets Laboratory, Carnegie Institution
for Science, Washington, District of Columbia 20015, United States
- Bayerisches
Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, D-95447 Bayreuth, Germany
| | - Dmytro M. Trots
- Bayerisches
Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, D-95447 Bayreuth, Germany
| | - Alexander V. Kurnosov
- Bayerisches
Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, D-95447 Bayreuth, Germany
| | - Irina Chuvashova
- Harvard
Physics, Jefferson Physical
Lab, 17 Oxford Street, Cambridge, Massachusetts 02138, United States
- Department
of Chemistry and Biochemistry, Florida International
University, 11200 SW
Eighth Street, CP 234, Miami, Florida 33199, United
States
| | - Sergey V. Ovsyannikov
- Bayerisches
Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, D-95447 Bayreuth, Germany
| | - Ivan Leonov
- M. N. Miheev
Institute of Metal Physics, Russian Academy
of Sciences, 620108 Yekaterinburg, Russia
- Ural
Federal University, 620002 Yekaterinburg, Russia
- Skolkovo
Institute of Science and Technology, 143026 Moscow, Russia
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3
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Khandarkhaeva S, Fedotenko T, Chariton S, Bykova E, Ovsyannikov SV, Glazyrin K, Liermann HP, Prakapenka V, Dubrovinskaia N, Dubrovinsky L. Structural Diversity of Magnetite and Products of Its Decomposition at Extreme Conditions. Inorg Chem 2021; 61:1091-1101. [PMID: 34962388 DOI: 10.1021/acs.inorgchem.1c03258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Magnetite, Fe3O4, is the oldest known magnetic mineral and archetypal mixed-valence oxide. Despite its recognized role in deep Earth processes, the behavior of magnetite at extreme high-pressure high-temperature (HPHT) conditions remains insufficiently studied. Here, we report on single-crystal synchrotron X-ray diffraction experiments up to ∼80 GPa and 5000 K in diamond anvil cells, which reveal two previously unknown Fe3O4 polymorphs, γ-Fe3O4 with the orthorhombic Yb3S4-type structure and δ-Fe3O4 with the modified Th3P4-type structure. The latter has never been predicted for iron compounds. The decomposition of Fe3O4 at HPHT conditions was found to result in the formation of exotic phases, Fe5O7 and Fe25O32, with complex structures. Crystal-chemical analysis of iron oxides suggests the high-spin to low-spin crossover in octahedrally coordinated Fe3+ in the pressure interval between 43 and 51 GPa. Our experiments demonstrate that HPHT conditions promote the formation of ferric-rich Fe-O compounds, thus arguing for the possible involvement of magnetite in the deep oxygen cycle.
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Affiliation(s)
- Saiana Khandarkhaeva
- Bayerisches Geoinstitut, University of Bayreuth, Universitätstraβe 30, 95440 Bayreuth, Germany.,Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, Universitätstraβe 30, 95440 Bayreuth, Germany
| | - Timofey Fedotenko
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, Universitätstraβe 30, 95440 Bayreuth, Germany
| | - Stella Chariton
- Center for Advanced Radiation Sources, University of Chicago, 5640 S. Ellis,Chicago, Illinois 60637, United States
| | - Elena Bykova
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, District of Columbia 20015, United States
| | - Sergey V Ovsyannikov
- Bayerisches Geoinstitut, University of Bayreuth, Universitätstraβe 30, 95440 Bayreuth, Germany.,Institute for Solid State Chemistry of Ural Branch of Russian Academy of Sciences, 91 Pervomayskaya Strasse, Yekaterinburg 620219, Russia
| | | | | | - Vitali Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, 5640 S. Ellis,Chicago, Illinois 60637, United States
| | - Natalia Dubrovinskaia
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, Universitätstraβe 30, 95440 Bayreuth, Germany.,Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83, Linköping, Sweden
| | - Leonid Dubrovinsky
- Bayerisches Geoinstitut, University of Bayreuth, Universitätstraβe 30, 95440 Bayreuth, Germany
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4
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Yang L, Zhang Y, Chen Y, Zhong X, Wang D, Lang J, Qu X, Yang J. Unconventional Stoichiometries of Na-O Compounds at High Pressures. MATERIALS (BASEL, SWITZERLAND) 2021; 14:7650. [PMID: 34947246 PMCID: PMC8707189 DOI: 10.3390/ma14247650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 12/04/2021] [Accepted: 12/10/2021] [Indexed: 11/16/2022]
Abstract
It has been realized that the stoichiometries of compounds may change under high pressure, which is crucial in the discovery of novel materials. This work uses systematic structure exploration and first-principles calculations to consider the stability of different stoichiometries of Na-O compounds with respect to pressure and, thus, construct a high-pressure stability field and convex hull diagram. Four previously unknown stoichiometries (NaO5, NaO4, Na4O, and Na3O) are predicted to be thermodynamically stable. Four new phases (P2/m and Cmc21 NaO2 and Immm and C2/m NaO3) of known stoichiometries are also found. The O-rich stoichiometries show the remarkable features of all the O atoms existing as quasimolecular O2 units and being metallic. Calculations of the O-O bond lengths and Bader charges are used to explore the electronic properties and chemical bonding of the O-rich compounds. The Na-rich compounds stabilized at extreme pressures (P > 200 GPa) are electrides with strong interstitial electron localization. The C2/c phase of Na3O is found to be a zero-dimensional electride with an insulating character. The Cmca phase of Na4O is a one-dimensional metallic electride. These findings of new compounds with unusual chemistry might stimulate future experimental and theoretical investigations.
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Affiliation(s)
- Lihua Yang
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, National Demonstration Center for Experimental Physics Education, College of Physics, Jilin Normal University, Siping 136000, China; (L.Y.); (Y.Z.); (X.Z.); (D.W.); (J.L.)
- State Key Laboratory of Integrated Optoelectronics, College of Materials Science and Engineering, Jilin University, Changchun 130012, China
| | - Yukai Zhang
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, National Demonstration Center for Experimental Physics Education, College of Physics, Jilin Normal University, Siping 136000, China; (L.Y.); (Y.Z.); (X.Z.); (D.W.); (J.L.)
| | - Yanli Chen
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, National Demonstration Center for Experimental Physics Education, College of Physics, Jilin Normal University, Siping 136000, China; (L.Y.); (Y.Z.); (X.Z.); (D.W.); (J.L.)
| | - Xin Zhong
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, National Demonstration Center for Experimental Physics Education, College of Physics, Jilin Normal University, Siping 136000, China; (L.Y.); (Y.Z.); (X.Z.); (D.W.); (J.L.)
| | - Dandan Wang
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, National Demonstration Center for Experimental Physics Education, College of Physics, Jilin Normal University, Siping 136000, China; (L.Y.); (Y.Z.); (X.Z.); (D.W.); (J.L.)
| | - Jihui Lang
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, National Demonstration Center for Experimental Physics Education, College of Physics, Jilin Normal University, Siping 136000, China; (L.Y.); (Y.Z.); (X.Z.); (D.W.); (J.L.)
| | - Xin Qu
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, National Demonstration Center for Experimental Physics Education, College of Physics, Jilin Normal University, Siping 136000, China; (L.Y.); (Y.Z.); (X.Z.); (D.W.); (J.L.)
| | - Jinghai Yang
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, National Demonstration Center for Experimental Physics Education, College of Physics, Jilin Normal University, Siping 136000, China; (L.Y.); (Y.Z.); (X.Z.); (D.W.); (J.L.)
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5
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Ovsyannikov SV, Tsirlin AA, Korobeynikov IV, Morozova NV, Aslandukova AA, Steinle-Neumann G, Chariton S, Khandarkhaeva S, Glazyrin K, Wilhelm F, Rogalev A, Dubrovinsky L. Synthesis of Ilmenite-type ε-Mn 2O 3 and Its Properties. Inorg Chem 2021; 60:13348-13358. [PMID: 34415155 DOI: 10.1021/acs.inorgchem.1c01666] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In contrast to the corundum-type A2X3 structure, which has only one crystallographic site available for trivalent cations (e.g., in hematite), the closely related ABX3 ilmenite-type structure comprises two different octahedrally coordinated positions that are usually filled with differently charged ions (e.g., in Fe2+Ti4+O3 ilmenite). Here, we report a synthesis of the first binary ilmenite-type compound fabricated from a simple transition-metal oxide (Mn2O3) at high-pressure high-temperature (HP-HT) conditions. We experimentally established that, at normal conditions, the ilmenite-type Mn2+Mn4+O3 (ε-Mn2O3) is an n-type semiconductor with an indirect narrow band gap of Eg = 0.55 eV. Comparative investigations of the electronic properties of ε-Mn2O3 and previously discovered quadruple perovskite ζ-Mn2O3 phase were performed using X-ray absorption near edge spectroscopy. Magnetic susceptibility measurements reveal an antiferromagnetic ordering in ε-Mn2O3 below 210 K. The synthesis of ε-Mn2O3 indicates that HP-HT conditions can induce a charge disproportionation in simple transition-metal oxides A2O3, and potentially various mixed-valence polymorphs of these oxides, for example, with ilmenite-type, LiNbO3-type, perovskite-type, and other structures, could be stabilized at HP-HT conditions.
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Affiliation(s)
- Sergey V Ovsyannikov
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany.,Institute for Solid State Chemistry of Ural Branch of Russian Academy of Sciences, 91 Pervomayskaya Str., 620219 Yekaterinburg, Russia
| | - Alexander A Tsirlin
- Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany
| | - Igor V Korobeynikov
- M. N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 18 S. Kovalevskaya Str., 620137 Yekaterinburg, Russia
| | - Natalia V Morozova
- M. N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 18 S. Kovalevskaya Str., 620137 Yekaterinburg, Russia
| | - Alena A Aslandukova
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany
| | - Gerd Steinle-Neumann
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany
| | - Stella Chariton
- The University of Chicago, Center for Advanced Radiation Sources, 60637 Chicago, Illinois, United States
| | - Saiana Khandarkhaeva
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, Universität Bayreuth, 95440 Bayreuth, Germany
| | - Konstantin Glazyrin
- Photon Science, Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany
| | - Fabrice Wilhelm
- European Synchrotron Radiation Facility, 71, avenue des Martyrs CS 40220, 38043 Grenoble Cedex 9, France
| | - Andrei Rogalev
- European Synchrotron Radiation Facility, 71, avenue des Martyrs CS 40220, 38043 Grenoble Cedex 9, France
| | - Leonid Dubrovinsky
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany
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6
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Ovsyannikov SV, Aslandukova AA, Aslandukov A, Chariton S, Tsirlin AA, Korobeynikov IV, Morozova NV, Fedotenko T, Khandarkhaeva S, Dubrovinsky L. Structural Stability and Properties of Marokite-Type γ-Mn 3O 4. Inorg Chem 2021; 60:13440-13452. [PMID: 34492760 DOI: 10.1021/acs.inorgchem.1c01782] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We synthesized single crystals of marokite (CaMn2O4)-type orthorhombic manganese (II,III) oxide, γ-Mn3O4, in a multianvil apparatus at pressures of 10-24 GPa. The magnetic, electronic, and optical properties of the crystals were investigated at ambient pressure. It was found that γ-Mn3O4 is a semiconductor with an indirect band gap Eg of 0.96 eV and two antiferromagnetic transitions (TN) at ∼200 and ∼55 K. The phase stability of the γ-Mn3O4 crystals was examined in the pressure range of 0-60 GPa using single-crystal X-ray diffraction and Raman spectroscopy. A bulk modulus of γ-Mn3O4 was determined to be B0 = 235.3(2) GPa with B' = 2.6(6). The γ-Mn3O4 phase persisted over the whole pressure range studied and did not transform or decompose upon laser heating of the sample to ∼3500 K at 60 GPa. This result seems surprising, given the high-pressure structural diversity of iron oxides with similar stoichiometries. With an increase in pressure, the degree of distortion of MnO6 polyhedra decreased. Furthermore, there are signs indicating a limited charge transfer between the Mn3+ ions in the octahedra and the Mn2+ ions in the trigonal prisms. Our results demonstrate that the high-pressure behavior of the structural, electronic, and chemical properties of manganese oxides strongly differs from that of iron oxides with similar stoichiometries.
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Affiliation(s)
- Sergey V Ovsyannikov
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, D-95447 Bayreuth, Germany.,Institute for Solid State Chemistry of Ural Branch of Russian Academy of Sciences, 91 Pervomayskaya Strasse, Yekaterinburg 620219, Russia
| | - Alena A Aslandukova
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, D-95447 Bayreuth, Germany
| | - Andrey Aslandukov
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440 Bayreuth, Germany
| | - Stella Chariton
- Center for Advanced Radiation Sources, The University of Chicago, Chicago, Illinois 60637, United States
| | - Alexander A Tsirlin
- Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany
| | - Igor V Korobeynikov
- M. N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 18 S. Kovalevskaya Strasse, Yekaterinburg 620137, Russia
| | - Natalia V Morozova
- M. N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 18 S. Kovalevskaya Strasse, Yekaterinburg 620137, Russia
| | - Timofey Fedotenko
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, D-95447 Bayreuth, Germany
| | - Saiana Khandarkhaeva
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440 Bayreuth, Germany
| | - Leonid Dubrovinsky
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, D-95447 Bayreuth, Germany
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7
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Liu J, Wang C, Lv C, Su X, Liu Y, Tang R, Chen J, Hu Q, Mao HK, Mao WL. Evidence for oxygenation of Fe-Mg oxides at mid-mantle conditions and the rise of deep oxygen. Natl Sci Rev 2021; 8:nwaa096. [PMID: 34691604 PMCID: PMC8288346 DOI: 10.1093/nsr/nwaa096] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 05/09/2020] [Accepted: 05/09/2020] [Indexed: 12/04/2022] Open
Abstract
As the reaction product of subducted water and the iron core, FeO2 with more oxygen than hematite (Fe2O3) has been recently recognized as an important component in the D" layer just above the Earth's core-mantle boundary. Here, we report a new oxygen-excess phase (Mg, Fe)2O3+ δ (0 < δ < 1, denoted as 'OE-phase'). It forms at pressures greater than 40 gigapascal when (Mg, Fe)-bearing hydrous materials are heated over 1500 kelvin. The OE-phase is fully recoverable to ambient conditions for ex situ investigation using transmission electron microscopy, which indicates that the OE-phase contains ferric iron (Fe3+) as in Fe2O3 but holds excess oxygen through interactions between oxygen atoms. The new OE-phase provides strong evidence that H2O has extraordinary oxidation power at high pressure. Unlike the formation of pyrite-type FeO2Hx which usually requires saturated water, the OE-phase can be formed with under-saturated water at mid-mantle conditions, and is expected to be more ubiquitous at depths greater than 1000 km in the Earth's mantle. The emergence of oxygen-excess reservoirs out of primordial or subducted (Mg, Fe)-bearing hydrous materials may revise our view on the deep-mantle redox chemistry.
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Affiliation(s)
- Jin Liu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
- Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA
| | - Chenxu Wang
- Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA
| | - Chaojia Lv
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Xiaowan Su
- School of Earth and Space Sciences, Peking University, Beijing 100871, China
| | - Yijin Liu
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Ruilian Tang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Jiuhua Chen
- Center for Study of Matter at Extreme Conditions, Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33199, USA
| | - Qingyang Hu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Ho-Kwang Mao
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
| | - Wendy L Mao
- Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
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8
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Koemets E, Leonov I, Bykov M, Bykova E, Chariton S, Aprilis G, Fedotenko T, Clément S, Rouquette J, Haines J, Cerantola V, Glazyrin K, McCammon C, Prakapenka VB, Hanfland M, Liermann HP, Svitlyk V, Torchio R, Rosa AD, Irifune T, Ponomareva AV, Abrikosov IA, Dubrovinskaia N, Dubrovinsky L. Revealing the Complex Nature of Bonding in the Binary High-Pressure Compound FeO_{2}. PHYSICAL REVIEW LETTERS 2021; 126:106001. [PMID: 33784165 DOI: 10.1103/physrevlett.126.106001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 12/07/2020] [Accepted: 01/07/2021] [Indexed: 06/12/2023]
Abstract
Extreme pressures and temperatures are known to drastically affect the chemistry of iron oxides, resulting in numerous compounds forming homologous series nFeOmFe_{2}O_{3} and the appearance of FeO_{2}. Here, based on the results of in situ single-crystal x-ray diffraction, Mössbauer spectroscopy, x-ray absorption spectroscopy, and density-functional theory+dynamical mean-field theory calculations, we demonstrate that iron in high-pressure cubic FeO_{2} and isostructural FeO_{2}H_{0.5} is ferric (Fe^{3+}), and oxygen has a formal valence less than 2. Reduction of oxygen valence from 2, common for oxides, down to 1.5 can be explained by a formation of a localized hole at oxygen sites.
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Affiliation(s)
- E Koemets
- Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany
- Institut Charles Gerhardt Montpellier (UMR CNRS 5253), Université de Montpellier, F-34095 Montpellier Cedex 5, France
| | - I Leonov
- Institute of Metal Physics, Sofia Kovalevskaya Street 18, 620219 Yekaterinburg GSP-170, Russia
- Materials Modeling and Development Laboratory, NUST "MISIS", 119049 Moscow, Russia
- Ural Federal University, 620002 Yekaterinburg, Russia
| | - M Bykov
- Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany
| | - E Bykova
- Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany
- Carnegie Institution of Washington, Earth and Planets Laboratory, 5241 Broad Branch Road NW, Washington, DC 20015, USA
| | - S Chariton
- Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany
| | - G Aprilis
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, Universität Bayreuth, D-95440 Bayreuth, Germany
- The European Synchrotron Radiation Facility, 38043 Grenoble Cedex 9, France
| | - T Fedotenko
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, Universität Bayreuth, D-95440 Bayreuth, Germany
| | - S Clément
- Laboratoire Charles Coulomb (L2C)-UMR CNRS 5221, Université de Montpellier, CC069, 34095 Montpellier, France
| | - J Rouquette
- Institut Charles Gerhardt Montpellier (UMR CNRS 5253), Université de Montpellier, F-34095 Montpellier Cedex 5, France
| | - J Haines
- Institut Charles Gerhardt Montpellier (UMR CNRS 5253), Université de Montpellier, F-34095 Montpellier Cedex 5, France
| | - V Cerantola
- The European Synchrotron Radiation Facility, 38043 Grenoble Cedex 9, France
| | - K Glazyrin
- Photon Science, Deutsches Elektronen-Synchrotron, D-22607 Hamburg, Germany
| | - C McCammon
- Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany
| | - V B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60437, USA
| | - M Hanfland
- The European Synchrotron Radiation Facility, 38043 Grenoble Cedex 9, France
| | - H-P Liermann
- Photon Science, Deutsches Elektronen-Synchrotron, D-22607 Hamburg, Germany
| | - V Svitlyk
- The European Synchrotron Radiation Facility, 38043 Grenoble Cedex 9, France
| | - R Torchio
- The European Synchrotron Radiation Facility, 38043 Grenoble Cedex 9, France
| | - A D Rosa
- The European Synchrotron Radiation Facility, 38043 Grenoble Cedex 9, France
| | - T Irifune
- Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, Matsuyama 790-8577, Japan
| | - A V Ponomareva
- Materials Modeling and Development Laboratory, NUST "MISIS", 119049 Moscow, Russia
| | - I A Abrikosov
- Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - N Dubrovinskaia
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, Universität Bayreuth, D-95440 Bayreuth, Germany
- Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - L Dubrovinsky
- Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany
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9
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Wang Y, Xu M, Yang L, Yan B, Qin Q, Shao X, Zhang Y, Huang D, Lin X, Lv J, Zhang D, Gou H, Mao HK, Chen C, Ma Y. Pressure-stabilized divalent ozonide CaO 3 and its impact on Earth's oxygen cycles. Nat Commun 2020; 11:4702. [PMID: 32943627 PMCID: PMC7499259 DOI: 10.1038/s41467-020-18541-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 08/25/2020] [Indexed: 11/16/2022] Open
Abstract
High pressure can drastically alter chemical bonding and produce exotic compounds that defy conventional wisdom. Especially significant are compounds pertaining to oxygen cycles inside Earth, which hold key to understanding major geological events that impact the environment essential to life on Earth. Here we report the discovery of pressure-stabilized divalent ozonide CaO3 crystal that exhibits intriguing bonding and oxidation states with profound geological implications. Our computational study identifies a crystalline phase of CaO3 by reaction of CaO and O2 at high pressure and high temperature conditions; ensuing experiments synthesize this rare compound under compression in a diamond anvil cell with laser heating. High-pressure x-ray diffraction data show that CaO3 crystal forms at 35 GPa and persists down to 20 GPa on decompression. Analysis of charge states reveals a formal oxidation state of -2 for ozone anions in CaO3. These findings unravel the ozonide chemistry at high pressure and offer insights for elucidating prominent seismic anomalies and oxygen cycles in Earth's interior. We further predict multiple reactions producing CaO3 by geologically abundant mineral precursors at various depths in Earth's mantle.
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Affiliation(s)
- Yanchao Wang
- State Key Lab of Superhard Materials & International Center for Computational Method and Software, College of Physics, Jilin University, Changchun, 130012, China
| | - Meiling Xu
- School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, 221116, China
| | - Liuxiang Yang
- Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China
| | - Bingmin Yan
- Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China
| | - Qin Qin
- Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China
| | - Xuecheng Shao
- State Key Lab of Superhard Materials & International Center for Computational Method and Software, College of Physics, Jilin University, Changchun, 130012, China
| | - Yunwei Zhang
- State Key Lab of Superhard Materials & International Center for Computational Method and Software, College of Physics, Jilin University, Changchun, 130012, China
| | - Dajian Huang
- Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China
| | - Xiaohuan Lin
- Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China
| | - Jian Lv
- State Key Lab of Superhard Materials & International Center for Computational Method and Software, College of Physics, Jilin University, Changchun, 130012, China
| | - Dongzhou Zhang
- Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa, Honolulu, HI, 96822, USA
| | - Huiyang Gou
- Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China.
| | - Ho-Kwang Mao
- Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, USA
| | - Changfeng Chen
- Department of Physics and Astronomy, University of Nevada, Las Vegas, NV, 89154, USA.
| | - Yanming Ma
- State Key Lab of Superhard Materials & International Center for Computational Method and Software, College of Physics, Jilin University, Changchun, 130012, China.
- International Center of Future Science, Jilin University, Changchun, 130012, China.
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10
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Evidence for complex iron oxides in the deep mantle from FeNi(Cu) inclusions in superdeep diamond. Proc Natl Acad Sci U S A 2020; 117:21088-21094. [PMID: 32817475 DOI: 10.1073/pnas.2004269117] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The recent discovery in high-pressure experiments of compounds stable to 24-26 GPa with Fe4O5, Fe5O6, Fe7O9, and Fe9O11 stoichiometry has raised questions about their existence within the Earth's mantle. Incorporating both ferric and ferrous iron in their structures, these oxides if present within the Earth could also provide insight into diamond-forming processes at depth in the planet. Here we report the discovery of metallic particles, dominantly of FeNi (Fe0.71Ni0.24Cu0.05), in close spatial relation with nearly pure magnetite grains from a so-called superdeep diamond from the Earth's mantle. The microstructural relation of magnetite within a ferropericlase (Mg0.60Fe0.40)O matrix suggests exsolution of the former. Taking into account the bulk chemistry reconstructed from the FeNi(Cu) alloy, we propose that it formed by decomposition of a complex metal M oxide (M 4O5) with a stoichiometry of (Fe3+ 2.15Fe2+ 1.59Ni2+ 0.17Cu+ 0.04)Σ = 3.95O5 We further suggest a possible link between this phase and variably oxidized ferropericlase that is commonly trapped in superdeep diamond. The observation of FeNi(Cu) metal in relation to magnetite exsolved from ferropericlase is interpreted as arising from a multistage process that starts from diamond encapsulation of ferropericlase followed by decompression and cooling under oxidized conditions, leading to the formation of complex oxides such as Fe4O5 that subsequently decompose at shallower P-T conditions.
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11
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Ovsyannikov SV, Bykov M, Medvedev SA, Naumov PG, Jesche A, Tsirlin AA, Bykova E, Chuvashova I, Karkin AE, Dyadkin V, Chernyshov D, Dubrovinsky LS. A Room-Temperature Verwey-type Transition in Iron Oxide, Fe 5 O 6. Angew Chem Int Ed Engl 2020; 59:5632-5636. [PMID: 31899577 PMCID: PMC7154779 DOI: 10.1002/anie.201914988] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Revised: 12/30/2019] [Indexed: 12/02/2022]
Abstract
Functional oxides whose physicochemical properties may be reversibly changed at standard conditions are potential candidates for the use in next‐generation nanoelectronic devices. To date, vanadium dioxide (VO2) is the only known simple transition‐metal oxide that demonstrates a near‐room‐temperature metal–insulator transition that may be used in such appliances. In this work, we synthesized and investigated the crystals of a novel mixed‐valent iron oxide with an unconventional Fe5O6 stoichiometry. Near 275 K, Fe5O6 undergoes a Verwey‐type charge‐ordering transition that is concurrent with a dimerization in the iron chains and a following formation of new Fe−Fe chemical bonds. This unique feature highlights Fe5O6 as a promising candidate for the use in innovative applications. We established that the minimal Fe−Fe distance in the octahedral chains is a key parameter that determines the type and temperature of charge ordering. This model provides new insights into charge‐ordering phenomena in transition‐metal oxides in general.
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Affiliation(s)
- Sergey V Ovsyannikov
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, 95447, Bayreuth, Germany.,Institute for Solid State Chemistry of Ural Branch of Russian Academy of Sciences, 91 Pervomayskaya Str., 620990, Yekaterinburg, Russia
| | - Maxim Bykov
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, 95447, Bayreuth, Germany.,Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Rd. NW, 20015, Washington, DC, USA
| | - Sergey A Medvedev
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Pavel G Naumov
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.,FSRC "Crystallography and Photonics" RAS, Leninskiy Prospekt 59, Moscow, 119333, Russia
| | - Anton Jesche
- Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135, Augsburg, Germany
| | - Alexander A Tsirlin
- Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135, Augsburg, Germany
| | - Elena Bykova
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, 95447, Bayreuth, Germany.,Deutsches Elektronen-Synchrotron (DESY), 22603, Hamburg, Germany
| | - Irina Chuvashova
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, 95447, Bayreuth, Germany
| | - Alexander E Karkin
- M. N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 18 S. Kovalevskaya Str., Yekaterinburg, 620137, Russia
| | - Vadim Dyadkin
- Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility, 38000, Grenoble, France
| | - Dmitry Chernyshov
- Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility, 38000, Grenoble, France
| | - Leonid S Dubrovinsky
- Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, 95447, Bayreuth, Germany
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12
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Ovsyannikov SV, Bykov M, Medvedev SA, Naumov PG, Jesche A, Tsirlin AA, Bykova E, Chuvashova I, Karkin AE, Dyadkin V, Chernyshov D, Dubrovinsky LS. A Room‐Temperature Verwey‐type Transition in Iron Oxide, Fe
5
O
6. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914988] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sergey V. Ovsyannikov
- Bayerisches Geoinstitut Universität Bayreuth Universitätsstrasse 30 95447 Bayreuth Germany
- Institute for Solid State Chemistry of Ural Branch of Russian Academy of Sciences 91 Pervomayskaya Str. 620990 Yekaterinburg Russia
| | - Maxim Bykov
- Bayerisches Geoinstitut Universität Bayreuth Universitätsstrasse 30 95447 Bayreuth Germany
- Geophysical Laboratory, Carnegie Institution of Washington 5251 Broad Branch Rd. NW 20015 Washington, DC USA
| | - Sergey A. Medvedev
- Max Planck Institute for Chemical Physics of Solids 01187 Dresden Germany
| | - Pavel G. Naumov
- Max Planck Institute for Chemical Physics of Solids 01187 Dresden Germany
- FSRC “Crystallography and Photonics” RAS Leninskiy Prospekt 59 Moscow 119333 Russia
| | - Anton Jesche
- Experimental Physics VI Center for Electronic Correlations and Magnetism Institute of Physics University of Augsburg 86135 Augsburg Germany
| | - Alexander A. Tsirlin
- Experimental Physics VI Center for Electronic Correlations and Magnetism Institute of Physics University of Augsburg 86135 Augsburg Germany
| | - Elena Bykova
- Bayerisches Geoinstitut Universität Bayreuth Universitätsstrasse 30 95447 Bayreuth Germany
- Deutsches Elektronen-Synchrotron (DESY) 22603 Hamburg Germany
| | - Irina Chuvashova
- Bayerisches Geoinstitut Universität Bayreuth Universitätsstrasse 30 95447 Bayreuth Germany
| | - Alexander E. Karkin
- M. N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences 18 S. Kovalevskaya Str. Yekaterinburg 620137 Russia
| | - Vadim Dyadkin
- Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility 38000 Grenoble France
| | - Dmitry Chernyshov
- Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility 38000 Grenoble France
| | - Leonid S. Dubrovinsky
- Bayerisches Geoinstitut Universität Bayreuth Universitätsstrasse 30 95447 Bayreuth Germany
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13
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Runowski M, Sobczak S, Marciniak J, Bukalska I, Lis S, Katrusiak A. Gold nanorods as a high-pressure sensor of phase transitions and refractive-index gauge. NANOSCALE 2019; 11:8718-8726. [PMID: 31017600 DOI: 10.1039/c9nr02792k] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Gold nanorods (Au NRs), nanospheres and other nanoparticles display numerous superior physicochemical properties, such as resistance to oxidation and aggressive agents, strong enhancement of local electric field and a high absorption coefficient in the visible and near-infrared (NIR) range. The absorption peaks of surface plasmon resonance (SPR) in Au NRs are highly sensitive to their surrounding medium and to its refractive index (RI) changes. However, no applications of NRs for detecting phase transitions have been reported. Here, we show that Au NRs effectively detect phase transitions of compressed compounds, liquid and solid, by measuring their RI. Owing to the direct interaction of the NRs with their surrounding medium, its subtle RI changes can be observed by the use of high-pressure absorption vis-NIR spectroscopy. We have applied a Au NR-based sensor in a diamond anvil cell (DAC) for monitoring the phase transitions of compressed water, its freezing to ice VI and at the subsequent solid-solid phase transition to ice VII, and the monotonic compression and solid-solid phase transitions in urea and thiourea.
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Affiliation(s)
- Marcin Runowski
- Adam Mickiewicz University, Faculty of Chemistry, Umultowska 89b, 61-614 Poznań, Poland.
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14
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Zhu SC, Liu J, Hu Q, Mao WL, Meng Y, Zhang D, Mao HK, Zhu Q. Structure-Controlled Oxygen Concentration in Fe 2O 3 and FeO 2. Inorg Chem 2019; 58:5476-5482. [PMID: 30556389 DOI: 10.1021/acs.inorgchem.8b02764] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Solid-solid reaction, particularly in the Fe-O binary system, has been extensively studied in the past decades because of its various applications in chemistry and materials and earth sciences. The recently synthesized pyrite-FeO2 at high pressure suggested a novel oxygen-rich stoichiometry that extends the achievable O-Fe ratio in iron oxides by 33%. Although FeO2 was synthesized from Fe2O3 and O2, the underlying solid reaction mechanism remains unclear. Herein, combining in situ X-ray diffraction experiments and first-principles calculations, we identified that two competing phase transitions starting from Fe2O3: (1) without O2, perovskite-Fe2O3 transits to the post-perovskite structure above 50 GPa; (2) if free oxygen is present, O diffuses into the perovskite-type lattice of Fe2O3 leading to the pyrite-type FeO2 phase. We found the O-O bonds in FeO2 are formed by the insertion of oxygen into the Pv lattice via the external stress and such O-O bonding is only kinetically stable under high pressure. This may provide a general mechanism of adding extra oxygen to previous known O saturated oxides to produce unconventional stoichiometries. Our results also shed light on how O is enriched in mantle minerals under pressure.
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Affiliation(s)
- Sheng-Cai Zhu
- Department of Physics and Astronomy, High Pressure Science and Engineering Center , University of Nevada , Las Vegas , Nevada 89154 , United States.,Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Shanghai 201203 , P. R. China
| | - Jin Liu
- Department of Geological Sciences , Stanford University , Stanford , California 94305 , United States
| | - Qingyang Hu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Shanghai 201203 , P. R. China
| | - Wendy L Mao
- Department of Geological Sciences , Stanford University , Stanford , California 94305 , United States
| | - Yue Meng
- High Pressure Collaborative Access Team, X-ray Science Division , Argonne National Laboratory , Argonne , Illinois 60439 , United States
| | - Dongzhou Zhang
- Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology , University of Hawai'i at Manoa , Honolulu , Hawaii 96822 , United States
| | - Ho-Kwang Mao
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Shanghai 201203 , P. R. China.,Geophysical Laboratory , Carnegie Institution of Washington , Washington, D.C. 20015 , United States
| | - Qiang Zhu
- Department of Physics and Astronomy, High Pressure Science and Engineering Center , University of Nevada , Las Vegas , Nevada 89154 , United States
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15
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Sarker HP, Rao PM, Huda MN. Niobium Doping in BiVO 4 : Interplay Between Effective Mass, Stability, and Pressure. Chemphyschem 2019; 20:773-784. [PMID: 30370996 DOI: 10.1002/cphc.201800792] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Revised: 10/23/2018] [Indexed: 11/06/2022]
Abstract
We have applied density functional theory to study the electronic structure changes caused by Nb incorporation in BiVO4 and the application of external pressure. The overall solubility of Nb in BiVO4 is usually high, and the presence of oxygen vacancies affect the dopability of Nb in BiVO4 . Through the analyses of the chemical-potential landscape, we have determined the single-phase stability zone of BiVO4 with the Nb doping. The most favorable Nb doping is simultaneous substitutions at both V- and Bi-sites. Even though Nb substitution at only V-site is next favorable, the band gap change is not very significant which agrees with an earlier experiment. However, it does change the electron effective mass by 20 % owing to the presence of Nb 4d bands in the conduction bands, which explains better catalytic activity by Nb-doped BiVO4 . In addition, application of external pressure the single-phase stability zone in the chemical-potential landscape. We have also focused on the local structural distortions near the Nb doping site, especially on the BiO8 octahedra. We have shown here that pressure-induced symmetrization of BiO8 dodecahedron lowers the electron's effective mass further and therefore can help to improve the photoconduction property of BiVO4 .
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Affiliation(s)
- Hori Pada Sarker
- Department of Physics, University of Texas at Arlington, Arlington, Texas, 76019, USA
| | - Pratap M Rao
- Department of Mechanical Engineering, Worcester Polytechnic Institute, MA, 01609, USA
| | - Muhammad N Huda
- Department of Physics, University of Texas at Arlington, Arlington, Texas, 76019, USA
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16
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Boulard E, Harmand M, Guyot F, Lelong G, Morard G, Cabaret D, Boccato S, Rosa AD, Briggs R, Pascarelli S, Fiquet G. Ferrous Iron Under Oxygen-Rich Conditions in the Deep Mantle. GEOPHYSICAL RESEARCH LETTERS 2019; 46:1348-1356. [PMID: 31007309 PMCID: PMC6472328 DOI: 10.1029/2019gl081922] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 01/20/2019] [Indexed: 05/31/2023]
Abstract
Recent experiments have demonstrated the existence of previously unknown iron oxides at high pressure and temperature including newly discovered pyrite-type FeO2 and FeO2Hx phases stable at deep terrestrial lower mantle pressures and temperatures. In the present study, we probed the iron oxidation state in high-pressure transformation products of Fe3+OOH goethite by in situ X-ray absorption spectroscopy in laser-heated diamond-anvil cell. At pressures and temperatures of ~91 GPa and 1,500-2,350 K, respectively, that is, in the previously reported stability field of FeO2Hx, a measured shift of -3.3 ± 0.1 eV of the Fe K-edge demonstrates that iron has turned from Fe3+ to Fe2+. We interpret this reductive valence change of iron by a concomitant oxidation of oxygen atoms from O2- to O-, in agreement with previous suggestions based on the structures of pyrite-type FeO2 and FeO2Hx phases. Such peculiar chemistry could drastically change our view of crystal chemistry in deep planetary interiors.
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Affiliation(s)
- E. Boulard
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, IRDInstitut de Minéralogie, Physique des Matériaux et Cosmochimie ‐ IMPMC4 Place Jussieu75005ParisFrance
| | - M. Harmand
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, IRDInstitut de Minéralogie, Physique des Matériaux et Cosmochimie ‐ IMPMC4 Place Jussieu75005ParisFrance
| | - F. Guyot
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, IRDInstitut de Minéralogie, Physique des Matériaux et Cosmochimie ‐ IMPMC4 Place Jussieu75005ParisFrance
| | - G. Lelong
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, IRDInstitut de Minéralogie, Physique des Matériaux et Cosmochimie ‐ IMPMC4 Place Jussieu75005ParisFrance
| | - G. Morard
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, IRDInstitut de Minéralogie, Physique des Matériaux et Cosmochimie ‐ IMPMC4 Place Jussieu75005ParisFrance
| | - D. Cabaret
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, IRDInstitut de Minéralogie, Physique des Matériaux et Cosmochimie ‐ IMPMC4 Place Jussieu75005ParisFrance
| | - S. Boccato
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, IRDInstitut de Minéralogie, Physique des Matériaux et Cosmochimie ‐ IMPMC4 Place Jussieu75005ParisFrance
- European Synchrotron Radiation FacilityGrenobleFrance
| | - A. D. Rosa
- European Synchrotron Radiation FacilityGrenobleFrance
| | - R. Briggs
- European Synchrotron Radiation FacilityGrenobleFrance
- Now at Lawrence Livermore National LaboratoryLivermoreCaliforniaUSA
| | - S. Pascarelli
- European Synchrotron Radiation FacilityGrenobleFrance
| | - G. Fiquet
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, IRDInstitut de Minéralogie, Physique des Matériaux et Cosmochimie ‐ IMPMC4 Place Jussieu75005ParisFrance
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17
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Hrubiak R, Smith JS, Shen G. Multimode scanning X-ray diffraction microscopy for diamond anvil cell experiments. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2019; 90:025109. [PMID: 30831723 DOI: 10.1063/1.5057518] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 11/10/2018] [Indexed: 06/09/2023]
Abstract
We have designed and implemented a new experimental system for fast mapping of crystal structures and other structural features of materials under high pressure at the High Pressure Collaborative Access Team, Sector 16 of the Advanced Photon Source. The system utilizes scanning X-ray diffraction microscopy (SXDM) and is optimized for use with diamond anvil cell devices. In SXDM, the X-ray diffraction (XRD) is collected in a forward scattering geometry from points on a two-dimensional grid by fly-scanning the sample with respect to a micro-focused X-ray beam. The recording of XRD is made during the continuous motion of the sample using a fast (millisecond) X-ray area detector in synchrony with the sample positioners, resulting in a highly efficient data collection for SXDM. A new computer program, X-ray Diffractive Imaging (XDI), has been developed with the SXDM system. The XDI program provides a graphical interface for constructing and displaying the SXDM images in several modes: (1) phase mapping based on structural information, (2) pressure visualization based on the equation of state, (3) microstructural features mapping based on peak shape parameters, and (4) grain size and preferred-orientation based on peak shape parameters. The XDI is a standalone program and can be generally used for displaying SXDM images. Two examples of iron and zirconium samples under high pressure are presented to demonstrate the applications of SXDM.
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Affiliation(s)
- Rostislav Hrubiak
- High Pressure Collaborative Access Team (HPCAT), X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Jesse S Smith
- High Pressure Collaborative Access Team (HPCAT), X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Guoyin Shen
- High Pressure Collaborative Access Team (HPCAT), X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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18
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Liu J, Hu Q, Bi W, Yang L, Xiao Y, Chow P, Meng Y, Prakapenka VB, Mao HK, Mao WL. Altered chemistry of oxygen and iron under deep Earth conditions. Nat Commun 2019; 10:153. [PMID: 30635572 PMCID: PMC6329810 DOI: 10.1038/s41467-018-08071-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 12/12/2018] [Indexed: 11/09/2022] Open
Abstract
A drastically altered chemistry was recently discovered in the Fe-O-H system under deep Earth conditions, involving the formation of iron superoxide (FeO2Hx with x = 0 to 1), but the puzzling crystal chemistry of this system at high pressures is largely unknown. Here we present evidence that despite the high O/Fe ratio in FeO2Hx, iron remains in the ferrous, spin-paired and non-magnetic state at 60-133 GPa, while the presence of hydrogen has minimal effects on the valence of iron. The reduced iron is accompanied by oxidized oxygen due to oxygen-oxygen interactions. The valence of oxygen is not -2 as in all other major mantle minerals, instead it varies around -1. This result indicates that like iron, oxygen may have multiple valence states in our planet's interior. Our study suggests a possible change in the chemical paradigm of how oxygen, iron, and hydrogen behave under deep Earth conditions.
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Affiliation(s)
- Jin Liu
- Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China.,Department of Geological Sciences, Stanford University, Stanford, CA, 94305, USA
| | - Qingyang Hu
- Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China.
| | - Wenli Bi
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA.,Department of Geology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Liuxiang Yang
- Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China.,Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, USA
| | - Yuming Xiao
- HPCAT, X-Ray Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Paul Chow
- HPCAT, X-Ray Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Yue Meng
- HPCAT, X-Ray Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, 60439, USA
| | - Ho-Kwang Mao
- Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China. .,Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, USA.
| | - Wendy L Mao
- Department of Geological Sciences, Stanford University, Stanford, CA, 94305, USA. .,Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.
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19
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Hong KH, Solana-Madruga E, Coduri M, Attfield JP. Complex Cation and Spin Orders in the High-Pressure Ferrite CoFe 3O 5. Inorg Chem 2018; 57:14347-14352. [PMID: 30382704 DOI: 10.1021/acs.inorgchem.8b02458] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A ferrite in the Sr2Tl2O5-type MFe3O5 family with M = Co has been synthesized at 12 GPa pressure. Neutron diffraction shows the sample to be Co deficient with composition Co0.6Fe3.4O5. The Co/Fe cation distribution is found to be profoundly different from those of MFe3O5 analogs and lies between normal and inverse limits, as Co2+ substitutes across trigonal prismatic and one of the two octahedral sites. CoFe3O5 shows complex magnetic behavior with weak ferromagnetism below TC1 ≈ 300 K and a second transition to ferrimagnetic order at TC2 ≈100 K. Spin scattering of carriers leads a substantial increase in the hopping activation energy below TC1, and a small negative magnetoresistance is observed at low temperatures.
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Affiliation(s)
- Ka H Hong
- Centre for Science at Extreme Conditions and School of Chemistry , University of Edinburgh , West Mains Road , Edinburgh EH9 3FD , United Kingdom
| | - Elena Solana-Madruga
- Centre for Science at Extreme Conditions and School of Chemistry , University of Edinburgh , West Mains Road , Edinburgh EH9 3FD , United Kingdom
| | - Mauro Coduri
- European Synchrotron Radiation Facility , 71 avenue des Martyrs , Grenoble 38000 , France
| | - J Paul Attfield
- Centre for Science at Extreme Conditions and School of Chemistry , University of Edinburgh , West Mains Road , Edinburgh EH9 3FD , United Kingdom
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20
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Stability and nature of the volume collapse of ε-Fe 2O 3 under extreme conditions. Nat Commun 2018; 9:4554. [PMID: 30385756 PMCID: PMC6212538 DOI: 10.1038/s41467-018-06966-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 09/27/2018] [Indexed: 11/09/2022] Open
Abstract
Iron oxides are among the major constituents of the deep Earth's interior. Among them, the epsilon phase of Fe2O3 is one of the less studied polymorphs and there is a lack of information about its structural, electronic and magnetic transformations at extreme conditions. Here we report the precise determination of its equation of state and a deep analysis of the evolution of the polyhedral units under compression, thanks to the agreement between our experiments and ab-initio simulations. Our results indicate that this material, with remarkable magnetic properties, is stable at pressures up to 27 GPa. Above 27 GPa, a volume collapse has been observed and ascribed to a change of the local environment of the tetrahedrally coordinated iron towards an octahedral coordination, finding evidence for a different iron oxide polymorph.
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21
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Abstract
A Verwey-type charge-ordering transition in magnetite at 120 K leads to the formation of linear units of three iron ions with one shared electron, called trimerons. The recently-discovered iron pentoxide (Fe4O5) comprising mixed-valent iron cations at octahedral chains, demonstrates another unusual charge-ordering transition at 150 K involving competing formation of iron trimerons and dimerons. Here, we experimentally show that applied pressure can tune the charge-ordering pattern in Fe4O5 and strongly affect the ordering temperature. We report two charge-ordered phases, the first of which may comprise both dimeron and trimeron units, whereas, the second exhibits an overall dimerization involving both the octahedral and trigonal-prismatic chains of iron in the crystal structure. We link the dramatic change in the charge-ordering pattern in the second phase to redistribution of electrons between the octahedral and prismatic iron chains, and propose that the average oxidation state of the iron cations can pre-determine a charge-ordering pattern. The charge order transition of commonly known magnetite has only recently been unraveled. Here, the measurement of the low-temperature high-pressure phase diagram of a related material (Fe4O5) elucidates the interplay of average oxidation state and charge-ordering phenomena in the iron oxide family.
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22
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Dziubek KF, Ende M, Scelta D, Bini R, Mezouar M, Garbarino G, Miletich R. Crystalline polymeric carbon dioxide stable at megabar pressures. Nat Commun 2018; 9:3148. [PMID: 30089845 PMCID: PMC6082874 DOI: 10.1038/s41467-018-05593-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 05/11/2018] [Indexed: 11/09/2022] Open
Abstract
Carbon dioxide is a widespread simple molecule in the Universe. In spite of its simplicity it has a very complex phase diagram, forming both amorphous and crystalline extended phases above 40 GPa. The stability range and nature of these phases are still debated, especially in view of their possible role within the deep carbon cycle. Here, we report static synchrotron X-ray diffraction and Raman high-pressure experiments in the megabar range providing evidence for the stability of the polymeric phase V at pressure-temperature conditions relevant to the Earth's lowermost mantle. The equation of state has been extended to 120 GPa and, contrary to earlier experimental findings, neither dissociation into diamond and ε-oxygen nor ionization was observed. Severe deviatoric stress and lattice deformation along with preferred orientation are removed on progressive annealing, thus suggesting CO2-V as the stable structure also above one megabar.
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Affiliation(s)
- Kamil F Dziubek
- LENS, European Laboratory for Non-linear Spectroscopy, Via N. Carrara 1, I-50019, Sesto Fiorentino, Firenze, Italy.
| | - Martin Ende
- Institut für Mineralogie und Kristallographie, Universität Wien, Althanstrasse 14, A-1090, Wien, Austria
| | - Demetrio Scelta
- LENS, European Laboratory for Non-linear Spectroscopy, Via N. Carrara 1, I-50019, Sesto Fiorentino, Firenze, Italy.,ICCOM-CNR, Institute of Chemistry of OrganoMetallic Compounds, National Research Council of Italy, Via Madonna del Piano 10, I-50019, Sesto Fiorentino, Firenze, Italy
| | - Roberto Bini
- LENS, European Laboratory for Non-linear Spectroscopy, Via N. Carrara 1, I-50019, Sesto Fiorentino, Firenze, Italy.,ICCOM-CNR, Institute of Chemistry of OrganoMetallic Compounds, National Research Council of Italy, Via Madonna del Piano 10, I-50019, Sesto Fiorentino, Firenze, Italy.,Dipartimento di Chimica "Ugo Schiff" dell'Università degli Studi di Firenze, Via della Lastruccia 3, I-50019, Sesto Fiorentino, Firenze, Italy
| | - Mohamed Mezouar
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, CS 40220, 38043, Grenoble Cedex 9, France
| | - Gaston Garbarino
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, CS 40220, 38043, Grenoble Cedex 9, France
| | - Ronald Miletich
- Institut für Mineralogie und Kristallographie, Universität Wien, Althanstrasse 14, A-1090, Wien, Austria
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23
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Bykov M, Bykova E, Koemets E, Fedotenko T, Aprilis G, Glazyrin K, Liermann HP, Ponomareva AV, Tidholm J, Tasnádi F, Abrikosov IA, Dubrovinskaia N, Dubrovinsky L. High-Pressure Synthesis of a Nitrogen-Rich Inclusion Compound ReN8
⋅x
N2
with Conjugated Polymeric Nitrogen Chains. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201805152] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Maxim Bykov
- Bayerisches Geoinstitute; University of Bayreuth; Universitätstrasse 30 95440 Bayreuth Germany
| | - Elena Bykova
- Photon Sciences; Deutsches Elektronen Synchrotron (DESY); Notkestrasse 85 22607 Hamburg Germany
| | - Egor Koemets
- Bayerisches Geoinstitute; University of Bayreuth; Universitätstrasse 30 95440 Bayreuth Germany
| | - Timofey Fedotenko
- Bayerisches Geoinstitute; University of Bayreuth; Universitätstrasse 30 95440 Bayreuth Germany
| | - Georgios Aprilis
- Material Physics and Technology at Extreme Conditions; Laboratory of Crystallography; University of Bayreuth; Universitätstrasse 30 95440 Bayreuth Germany
| | - Konstantin Glazyrin
- Photon Sciences; Deutsches Elektronen Synchrotron (DESY); Notkestrasse 85 22607 Hamburg Germany
| | - Hanns-Peter Liermann
- Photon Sciences; Deutsches Elektronen Synchrotron (DESY); Notkestrasse 85 22607 Hamburg Germany
| | - Alena V. Ponomareva
- Materials Modeling and Development Laboratory; National University of Science and Technology “MISIS”; Moscow 119049 Russia
| | - Johan Tidholm
- Department of Physics, Chemistry and Biology (IFM); Linköping University; Linköping SE-58183 Sweden
| | - Ferenc Tasnádi
- Department of Physics, Chemistry and Biology (IFM); Linköping University; Linköping SE-58183 Sweden
| | - Igor A. Abrikosov
- Department of Physics, Chemistry and Biology (IFM); Linköping University; Linköping SE-58183 Sweden
| | - Natalia Dubrovinskaia
- Material Physics and Technology at Extreme Conditions; Laboratory of Crystallography; University of Bayreuth; Universitätstrasse 30 95440 Bayreuth Germany
| | - Leonid Dubrovinsky
- Bayerisches Geoinstitute; University of Bayreuth; Universitätstrasse 30 95440 Bayreuth Germany
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24
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Bykov M, Bykova E, Koemets E, Fedotenko T, Aprilis G, Glazyrin K, Liermann HP, Ponomareva AV, Tidholm J, Tasnádi F, Abrikosov IA, Dubrovinskaia N, Dubrovinsky L. High-Pressure Synthesis of a Nitrogen-Rich Inclusion Compound ReN8
⋅x
N2
with Conjugated Polymeric Nitrogen Chains. Angew Chem Int Ed Engl 2018; 57:9048-9053. [DOI: 10.1002/anie.201805152] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Maxim Bykov
- Bayerisches Geoinstitute; University of Bayreuth; Universitätstrasse 30 95440 Bayreuth Germany
| | - Elena Bykova
- Photon Sciences; Deutsches Elektronen Synchrotron (DESY); Notkestrasse 85 22607 Hamburg Germany
| | - Egor Koemets
- Bayerisches Geoinstitute; University of Bayreuth; Universitätstrasse 30 95440 Bayreuth Germany
| | - Timofey Fedotenko
- Bayerisches Geoinstitute; University of Bayreuth; Universitätstrasse 30 95440 Bayreuth Germany
| | - Georgios Aprilis
- Material Physics and Technology at Extreme Conditions; Laboratory of Crystallography; University of Bayreuth; Universitätstrasse 30 95440 Bayreuth Germany
| | - Konstantin Glazyrin
- Photon Sciences; Deutsches Elektronen Synchrotron (DESY); Notkestrasse 85 22607 Hamburg Germany
| | - Hanns-Peter Liermann
- Photon Sciences; Deutsches Elektronen Synchrotron (DESY); Notkestrasse 85 22607 Hamburg Germany
| | - Alena V. Ponomareva
- Materials Modeling and Development Laboratory; National University of Science and Technology “MISIS”; Moscow 119049 Russia
| | - Johan Tidholm
- Department of Physics, Chemistry and Biology (IFM); Linköping University; Linköping SE-58183 Sweden
| | - Ferenc Tasnádi
- Department of Physics, Chemistry and Biology (IFM); Linköping University; Linköping SE-58183 Sweden
| | - Igor A. Abrikosov
- Department of Physics, Chemistry and Biology (IFM); Linköping University; Linköping SE-58183 Sweden
| | - Natalia Dubrovinskaia
- Material Physics and Technology at Extreme Conditions; Laboratory of Crystallography; University of Bayreuth; Universitätstrasse 30 95440 Bayreuth Germany
| | - Leonid Dubrovinsky
- Bayerisches Geoinstitute; University of Bayreuth; Universitätstrasse 30 95440 Bayreuth Germany
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25
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Souza FL. Sunlight-driven water splitting using hematite nanorod photoelectrodes. AN ACAD BRAS CIENC 2018; 90:745-762. [PMID: 29742209 DOI: 10.1590/0001-3765201820170581] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Accepted: 09/06/2017] [Indexed: 11/22/2022] Open
Abstract
The efficiency of nanostructures for photoelectrochemical water-splitting is fundamentally governed by the capability of the surface to sustain the reaction without electron trapping or recombination by photogenerated holes. This brief review will summarize the latest progress on hematite, designed with columnar morphology via chemical synthesis, for photoelectrochemical cell application. The columnar morphology efficiently minimizes the number of defects, grain boundaries, and surface traps normally present on the planar morphology. The major drawback related to hole diffusion through the solid/liquid interface was addressed by using high annealing temperature combined with dopant addition. A critical view and depth of understanding of these two parameters were discussed focusing on the molecular oxygen evolution mechanism from the sunlight-driven water oxidation reaction.
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Affiliation(s)
- Flavio L Souza
- Laboratory of Alternative Energy and Nanomaterials, Universidade Federal do ABC, Santo André, SP, Brazil
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26
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Hong KH, Arevalo-Lopez AM, Coduri M, McNally GM, Attfield JP. Cation, magnetic, and charge ordering in MnFe 3O 5. JOURNAL OF MATERIALS CHEMISTRY. C 2018; 6:3271-3275. [PMID: 30009028 PMCID: PMC6003543 DOI: 10.1039/c8tc00053k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 01/16/2018] [Indexed: 05/22/2023]
Abstract
The recently-discovered high pressure material MnFe3O5 displays a rich variety of magnetically ordered states on cooling. Fe spins order antiferromagnetically below a Néel transition at 350 K. A second transition at 150 K marks Mn spin order that leads to spin canting of some of the Fe spins and ferrimagnetism. A further transition at 60 K is driven by charge ordering of Fe2+ and Fe3+ over two inequivalent Fe sites, with further canting of all spins. Electrical resistivity measurements reveal semiconducting behaviour in MnFe3O5 with a change in activation energy at 285 K.
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Affiliation(s)
- K H Hong
- Centre for Science at Extreme Conditions and School of Chemistry , University of Edinburgh , Mayfield Road , Edinburgh EH9 3JZ , UK .
| | - A M Arevalo-Lopez
- Univ. Lille , CNRS , Centrale Lille , ENSCL , Univ. Artois , UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide , F-59000 Lille , France
| | - M Coduri
- European Synchrotron Radiation Facility , 71 avenue des Martyrs , Grenoble , 38000 , France
| | - G M McNally
- Centre for Science at Extreme Conditions and School of Chemistry , University of Edinburgh , Mayfield Road , Edinburgh EH9 3JZ , UK .
| | - J P Attfield
- Centre for Science at Extreme Conditions and School of Chemistry , University of Edinburgh , Mayfield Road , Edinburgh EH9 3JZ , UK .
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27
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Stability and anisotropy of (Fe xNi 1-x) 2O under high pressure and implications in Earth's and super-Earths' core. Sci Rep 2018; 8:236. [PMID: 29321631 PMCID: PMC5762755 DOI: 10.1038/s41598-017-18678-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Accepted: 12/15/2017] [Indexed: 11/08/2022] Open
Abstract
Oxygen is thought to be an important light element in Earth's core but the amount of oxygen in Earth's core remains elusive. In addition, iron-rich iron oxides are of great interest and significance in the field of geoscience and condensed matter physics. Here, static calculations based on density functional theory demonstrate that I4/mmm-Fe2O is dynamically and mechanically stable and becomes energetically favorable with respect to the assemblage of hcp-Fe and [Formula: see text]-FeO above 270 GPa, which indicates that I4/mmm-Fe2O can be a strong candidate phase for stable iron-rich iron oxides at high pressure, perhaps even at high temperature. The elasticity and anisotropy of I4/mmm-(FexNi1-x)2O at high pressures are also determined. Based on these results, we have derived the upper limit of oxygen to be 4.3 wt% in Earth's lower outer core. On the other hand, I4/mmm-(FexNi1-x)2O with high AV S is likely to exist in a super-Earth's or an ocean planet's solid core causing the locally seismic heterogeneity. Our results not only give some clues to explore and synthesize novel iron-rich iron oxides but also shed light on the fundamental information of oxygen in the planetary core.
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28
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Mao HK, Hu Q, Yang L, Liu J, Kim DY, Meng Y, Zhang L, Prakapenka VB, Yang W, Mao WL. When water meets iron at Earth's core–mantle boundary. Natl Sci Rev 2017. [DOI: 10.1093/nsr/nwx109] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Hydrous minerals in subducted crust can transport large amounts of water into Earth's deep mantle. Our laboratory experiments revealed the surprising pressure-induced chemistry that, when water meets iron at the core–mantle boundary, they react to form an interlayer with an extremely oxygen-rich form of iron, iron dioxide, together with iron hydride. Hydrogen in the layer will escape upon further heating and rise to the crust, sustaining the water cycle. With water supplied by the subducting slabs meeting the nearly inexhaustible iron source in the core, an oxygen-rich layer would cumulate and thicken, leading to major global consequences in our planet. The seismic signature of the D″ layer may echo the chemical complexity of this layer. Over the course of geological time, the enormous oxygen reservoir accumulating between the mantle and core may have eventually reached a critical eruption point. Very large-scale oxygen eruptions could possibly cause major activities in the mantle convection and leave evidence such as the rifting of supercontinents and the Great Oxidation Event.
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Affiliation(s)
- Ho-Kwang Mao
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
- Geophysical Laboratory, Carnegie Institution, Washington, DC 20015, USA
| | - Qingyang Hu
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
- Geophysical Laboratory, Carnegie Institution, Washington, DC 20015, USA
- Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA
| | - Liuxiang Yang
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
- Geophysical Laboratory, Carnegie Institution, Washington, DC 20015, USA
| | - Jin Liu
- Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA
| | - Duck Young Kim
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Yue Meng
- High Pressure Collaborative Access Team (HPCAT), Geophysical Laboratory, Carnegie Institution, Argonne, IL 60439, USA
| | - Li Zhang
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, IL 60437, USA
| | - Wenge Yang
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Wendy L Mao
- Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA
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29
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Hong KH, McNally GM, Coduri M, Attfield JP. Synthesis, Crystal Structure, and Magnetic Properties of MnFe3O5. Z Anorg Allg Chem 2016. [DOI: 10.1002/zaac.201600365] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ka H. Hong
- Centre for Science at Extreme Conditions and School of Chemistry; University of Edinburgh; Mayfield Road EH9 3JZ Edinburgh UK
| | - Graham M. McNally
- Centre for Science at Extreme Conditions and School of Chemistry; University of Edinburgh; Mayfield Road EH9 3JZ Edinburgh UK
| | - Mauro Coduri
- European Synchrotron Radiation Facility; 71 avenue des Martyrs 38000 Grenoble France
| | - J. Paul Attfield
- Centre for Science at Extreme Conditions and School of Chemistry; University of Edinburgh; Mayfield Road EH9 3JZ Edinburgh UK
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30
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Discovery of Fe7O9: a new iron oxide with a complex monoclinic structure. Sci Rep 2016; 6:32852. [PMID: 27605075 PMCID: PMC5015080 DOI: 10.1038/srep32852] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 08/15/2016] [Indexed: 11/24/2022] Open
Abstract
Iron oxides are fundamentally important compounds for basic and applied sciences as well as in numerous industrial applications. In this work we report the synthesis and investigation of a new binary iron oxide with the hitherto unknown stoichiometry of Fe7O9. This new oxide was synthesized at high-pressure high-temperature (HP-HT) conditions, and its black single crystals were successfully recovered at ambient conditions. By means of single crystal X-ray diffraction we determined that Fe7O9 adopts a monoclinic C2/m lattice with the most distorted crystal structure among the binary iron oxides known to date. The synthesis of Fe7O9 opens a new portal to exotic iron-rich (M,Fe)7O9 oxides with unusual stoichiometry and distorted crystal structures. Moreover, the crystal structure and phase relations of such new iron oxide groups may provide new insight into the cycling of volatiles in the Earth’s interior.
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31
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FeO2 and FeOOH under deep lower-mantle conditions and Earth’s oxygen–hydrogen cycles. Nature 2016; 534:241-4. [DOI: 10.1038/nature18018] [Citation(s) in RCA: 194] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 04/12/2016] [Indexed: 11/08/2022]
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32
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Bykova E, Dubrovinsky L, Dubrovinskaia N, Bykov M, McCammon C, Ovsyannikov SV, Liermann HP, Kupenko I, Chumakov AI, Rüffer R, Hanfland M, Prakapenka V. Structural complexity of simple Fe2O3 at high pressures and temperatures. Nat Commun 2016; 7:10661. [PMID: 26864300 PMCID: PMC4753252 DOI: 10.1038/ncomms10661] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 01/08/2016] [Indexed: 11/09/2022] Open
Abstract
Although chemically very simple, Fe2O3 is known to undergo a series of enigmatic structural, electronic and magnetic transformations at high pressures and high temperatures. So far, these transformations have neither been correctly described nor understood because of the lack of structural data. Here we report a systematic investigation of the behaviour of Fe2O3 at pressures over 100 GPa and temperatures above 2,500 K employing single crystal X-ray diffraction and synchrotron Mössbauer source spectroscopy. Crystal chemical analysis of structures presented here and known Fe(II, III) oxides shows their fundamental relationships and that they can be described by the homologous series nFeO·mFe2O3. Decomposition of Fe2O3 and Fe3O4 observed at pressures above 60 GPa and temperatures of 2,000 K leads to crystallization of unusual Fe5O7 and Fe25O32 phases with release of oxygen. Our findings suggest that mixed-valence iron oxides may play a significant role in oxygen cycling between earth reservoirs.
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Affiliation(s)
- E Bykova
- Bayerisches Geoinstitut, University of Bayreuth, Universitaetsstrasse 30, D-95447 Bayreuth, Germany.,Laboratory of Crystallography, University of Bayreuth, Universitaetsstrasse 30, D-95447 Bayreuth, Germany
| | - L Dubrovinsky
- Bayerisches Geoinstitut, University of Bayreuth, Universitaetsstrasse 30, D-95447 Bayreuth, Germany
| | - N Dubrovinskaia
- Laboratory of Crystallography, University of Bayreuth, Universitaetsstrasse 30, D-95447 Bayreuth, Germany
| | - M Bykov
- Bayerisches Geoinstitut, University of Bayreuth, Universitaetsstrasse 30, D-95447 Bayreuth, Germany.,Laboratory of Crystallography, University of Bayreuth, Universitaetsstrasse 30, D-95447 Bayreuth, Germany
| | - C McCammon
- Bayerisches Geoinstitut, University of Bayreuth, Universitaetsstrasse 30, D-95447 Bayreuth, Germany
| | - S V Ovsyannikov
- Bayerisches Geoinstitut, University of Bayreuth, Universitaetsstrasse 30, D-95447 Bayreuth, Germany
| | - H-P Liermann
- Photon Sciences, Deutsches Elektronen-Synchrotron, Notkestrasse 85, D-22607 Hamburg, Germany
| | - I Kupenko
- Bayerisches Geoinstitut, University of Bayreuth, Universitaetsstrasse 30, D-95447 Bayreuth, Germany.,European Synchrotron Radiation Facility, 71 avenue des Martyrs, Grenoble F-38000, France
| | - A I Chumakov
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, Grenoble F-38000, France
| | - R Rüffer
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, Grenoble F-38000, France
| | - M Hanfland
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, Grenoble F-38000, France
| | - V Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, 9700 South Cass Avenue, Illinois, Argonne 60437, USA
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