1
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Huang XL. Unveiling the role of inorganic nanoparticles in Earth's biochemical evolution through electron transfer dynamics. iScience 2024; 27:109555. [PMID: 38638571 PMCID: PMC11024932 DOI: 10.1016/j.isci.2024.109555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2024] Open
Abstract
This article explores the intricate interplay between inorganic nanoparticles and Earth's biochemical history, with a focus on their electron transfer properties. It reveals how iron oxide and sulfide nanoparticles, as examples of inorganic nanoparticles, exhibit oxidoreductase activity similar to proteins. Termed "life fossil oxidoreductases," these inorganic enzymes influence redox reactions, detoxification processes, and nutrient cycling in early Earth environments. By emphasizing the structural configuration of nanoparticles and their electron conformation, including oxygen defects and metal vacancies, especially electron hopping, the article provides a foundation for understanding inorganic enzyme mechanisms. This approach, rooted in physics, underscores that life's origin and evolution are governed by electron transfer principles within the framework of chemical equilibrium. Today, these nanoparticles serve as vital biocatalysts in natural ecosystems, participating in critical reactions for ecosystem health. The research highlights their enduring impact on Earth's history, shaping ecosystems and interacting with protein metal centers through shared electron transfer dynamics, offering insights into early life processes and adaptations.
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Affiliation(s)
- Xiao-Lan Huang
- Center for Clean Water Technology, School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY 11794-6044, USA
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2
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Huang XL, Harmer JR, Schenk G, Southam G. Inorganic Fe-O and Fe-S oxidoreductases: paradigms for prebiotic chemistry and the evolution of enzymatic activity in biology. Front Chem 2024; 12:1349020. [PMID: 38389729 PMCID: PMC10881703 DOI: 10.3389/fchem.2024.1349020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Accepted: 01/23/2024] [Indexed: 02/24/2024] Open
Abstract
Oxidoreductases play crucial roles in electron transfer during biological redox reactions. These reactions are not exclusive to protein-based biocatalysts; nano-size (<100 nm), fine-grained inorganic colloids, such as iron oxides and sulfides, also participate. These nanocolloids exhibit intrinsic redox activity and possess direct electron transfer capacities comparable to their biological counterparts. The unique metal ion architecture of these nanocolloids, including electron configurations, coordination environment, electron conductivity, and the ability to promote spontaneous electron hopping, contributes to their transfer capabilities. Nano-size inorganic colloids are believed to be among the earliest 'oxidoreductases' to have 'evolved' on early Earth, playing critical roles in biological systems. Representing a distinct type of biocatalysts alongside metalloproteins, these nanoparticles offer an early alternative to protein-based oxidoreductase activity. While the roles of inorganic nano-sized catalysts in current Earth ecosystems are intuitively significant, they remain poorly understood and underestimated. Their contribution to chemical reactions and biogeochemical cycles likely helped shape and maintain the balance of our planet's ecosystems. However, their potential applications in biomedical, agricultural, and environmental protection sectors have not been fully explored or exploited. This review examines the structure, properties, and mechanisms of such catalysts from a material's evolutionary standpoint, aiming to raise awareness of their potential to provide innovative solutions to some of Earth's sustainability challenges.
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Affiliation(s)
- Xiao-Lan Huang
- NYS Center for Clean Water Technology, School of Marine and Atmospheric Sciences, Stony Brook, NY, United States
| | - Jeffrey R Harmer
- Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia
| | - Gerhard Schenk
- Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia
- Sustainable Minerals Institute, The University of Queensland, Brisbane, QLD, Australia
| | - Gordon Southam
- Sustainable Minerals Institute, The University of Queensland, Brisbane, QLD, Australia
- School of the Environment, The University of Queensland, Brisbane, QLD, Australia
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3
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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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4
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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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [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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5
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Attfield JP. Magnetism and the Trimeron Bond. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2022; 34:2877-2885. [PMID: 35814039 PMCID: PMC9261838 DOI: 10.1021/acs.chemmater.2c00275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 03/14/2022] [Indexed: 05/06/2023]
Abstract
A review of progress in understanding the Verwey transition in magnetite (Fe3O4) over the past decade is presented. This electronic and structural transition at T V ≈ 125 K was reported in 1939 and has since been a contentious issue in magnetism. Long range Fe2+/Fe3+ charge ordering has been confirmed below the transition from crystal structure refinement, and Fe2+ orbital ordering and formation of trimerons through weak bonding of Fe2+ states to two Fe neighbors has been discovered. This model has accounted for many spectroscopic observations such as the 57Fe NMR frequencies. The trimeron lifetime has been measured, and trimeron soft modes have been observed. The origin of the first to second order crossover of Verwey transitions in doped magnetites has been revealed by a nanoparticle study. Electronic and structural fluctuations are found to persist to temperatures far above T V and local structural distortions track the bulk magnetization, disappearing at the 850 K Curie transition. New binary mixed-valent iron oxides discovered at high pressure are found to have electronic transitions and orbital molecule ground states similar to those of magnetite.
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6
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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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7
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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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8
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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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9
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Coduri M, Masala P, Del Bianco L, Spizzo F, Ceresoli D, Castellano C, Cappelli S, Oliva C, Checchia S, Allieta M, Szabo DV, Schlabach S, Hagelstein M, Ferrero C, Scavini M. Local Structure and Magnetism of Fe 2O 3 Maghemite Nanocrystals: The Role of Crystal Dimension. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E867. [PMID: 32365930 PMCID: PMC7279456 DOI: 10.3390/nano10050867] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 04/22/2020] [Accepted: 04/23/2020] [Indexed: 01/08/2023]
Abstract
Here we report on the impact of reducing the crystalline size on the structural and magnetic properties of γ-Fe2O3 maghemite nanoparticles. A set of polycrystalline specimens with crystallite size ranging from ~2 to ~50 nm was obtained combining microwave plasma synthesis and commercial samples. Crystallite size was derived by electron microscopy and synchrotron powder diffraction, which was used also to investigate the crystallographic structure. The local atomic structure was inquired combining pair distribution function (PDF) and X-ray absorption spectroscopy (XAS). PDF revealed that reducing the crystal dimension induces the depletion of the amount of Fe tetrahedral sites. XAS confirmed significant bond distance expansion and a loose Fe-Fe connectivity between octahedral and tetrahedral sites. Molecular dynamics revealed important surface effects, whose implementation in PDF reproduces the first shells of experimental curves. The structural disorder affects the magnetic properties more and more with decreasing the nanoparticle size. In particular, the saturation magnetization reduces, revealing a spin canting effect. Moreover, a large effective magnetic anisotropy is measured at low temperature together with an exchange bias effect, a behavior that we related to the existence of a highly disordered glassy magnetic phase.
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Affiliation(s)
- Mauro Coduri
- Department of Chemistry, University of Pavia, viale Taramelli 16, 27100 Pavia, Italy
| | - Paolo Masala
- Department of Chemistry, University of Milan, via Golgi 19, 20131 Milano, Italy; (P.M.); (C.C.); (S.C.); (C.O.); (M.A.)
| | - Lucia Del Bianco
- Department of Physics and Earth Sciences, University of Ferrara, via Saragat 1, 44122 Ferrara, Italy; (L.D.B.); (F.S.)
| | - Federico Spizzo
- Department of Physics and Earth Sciences, University of Ferrara, via Saragat 1, 44122 Ferrara, Italy; (L.D.B.); (F.S.)
| | - Davide Ceresoli
- National Research Council of Italy, Institute of Chemical Science and Technology (CNR-SCITEC), 20133 Milano, Italy;
| | - Carlo Castellano
- Department of Chemistry, University of Milan, via Golgi 19, 20131 Milano, Italy; (P.M.); (C.C.); (S.C.); (C.O.); (M.A.)
| | - Serena Cappelli
- Department of Chemistry, University of Milan, via Golgi 19, 20131 Milano, Italy; (P.M.); (C.C.); (S.C.); (C.O.); (M.A.)
| | - Cesare Oliva
- Department of Chemistry, University of Milan, via Golgi 19, 20131 Milano, Italy; (P.M.); (C.C.); (S.C.); (C.O.); (M.A.)
| | | | - Mattia Allieta
- Department of Chemistry, University of Milan, via Golgi 19, 20131 Milano, Italy; (P.M.); (C.C.); (S.C.); (C.O.); (M.A.)
| | - Dorothee-Vinga Szabo
- Karlsruhe Institute of Technology, Institute for Applied Materials (IAM) and Karlsruhe Nano Micro Facility (KNMF), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (D.-V.S.); (S.S.)
| | - Sabine Schlabach
- Karlsruhe Institute of Technology, Institute for Applied Materials (IAM) and Karlsruhe Nano Micro Facility (KNMF), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany; (D.-V.S.); (S.S.)
| | - Michael Hagelstein
- Karlsruhe Institute of Technology, Institute for Beam Physics and Technology (IBPT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;
| | - Claudio Ferrero
- European Synchrotron Radiation Facility, 38000 Grenoble, France;
| | - Marco Scavini
- Department of Chemistry, University of Milan, via Golgi 19, 20131 Milano, Italy; (P.M.); (C.C.); (S.C.); (C.O.); (M.A.)
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10
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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: 9] [Impact Index Per Article: 2.3] [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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