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Gorelova L, Pakhomova A, Aprilis G, Yin Y, Laniel D, Winkler B, Krivovichev S, Pekov I, Dubrovinskaia N, Dubrovinsky L. Edge-sharing BO 4 tetrahedra and penta-coordinated silicon in the high-pressure modification of NaBSi 3O 8. Inorg Chem Front 2022. [DOI: 10.1039/d2qi00101b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High-pressure modification of NaBSi3O8 results in the first example of a borosilicate compound containing edge-sharing BO4 tetrahedra and SiO5 polyhedra.
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Affiliation(s)
- Liudmila Gorelova
- Crystallography Department, Institute of Earth Science, Saint Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia
| | - Anna Pakhomova
- Deutsches Elektronen-Synchrotron (DESY), Petra III, Notkestraße 85, 22607 Hamburg, Germany
- European Synchrotron Radiation Facility, 71 Av. des Martyrs, 38000 Grenoble, France
| | - Georgios Aprilis
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440, Bayreuth, Germany
| | - Yuqing Yin
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440, Bayreuth, Germany
| | - Dominique Laniel
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440, Bayreuth, Germany
| | - Bjoern Winkler
- Institute für Geowissenschaften, Frankfurt University, Altenhöferallee 1, DE-60438 Frankfurt am Main, Germany
| | - Sergey Krivovichev
- Crystallography Department, Institute of Earth Science, Saint Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia
- Kola Science Centre, Russian Academy of Sciences, Fersman str. 14, 184209 Apatity, Russia
| | - Igor Pekov
- Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
| | - Natalia Dubrovinskaia
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440, Bayreuth, Germany
- Department of Physics, Chemistry and Biology (IFM), Linkoeping University, SE-581 83, Linkoeping, Sweden
| | - Leonid Dubrovinsky
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
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Pakhomova A, Fuchs B, Dubrovinsky LS, Dubrovinskaia N, Huppertz H. Polymorphs of the Gadolinite-Type Borates ZrB 2 O 5 and HfB 2 O 5 Under Extreme Pressure. Chemistry 2021; 27:6007-6014. [PMID: 33544397 PMCID: PMC8049040 DOI: 10.1002/chem.202005244] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Indexed: 11/20/2022]
Abstract
Based on the results from previous high‐pressure experiments on the gadolinite‐type mineral datolite, CaBSiO4(OH), the behavior of the isostructural borates β‐HfB2O5 and β‐ZrB2O5 have been studied by synchrotron‐based in situ high‐pressure single‐crystal X‐ray diffraction experiments. On compression to 120 GPa, both borate layer‐structures are preserved. Additionally, at ≈114 GPa, the formation of a second phase can be observed in both compounds. The new high‐pressure modification γ‐ZrB2O5 features a rearrangement of the corner‐sharing BO4 tetrahedra, while still maintaining the four‐ and eight‐membered rings. The new phase γ‐HfB2O5 contains ten‐membered rings including the rare structural motif of edge‐sharing BO4 tetrahedra with exceptionally short B−O and B⋅⋅⋅B distances. For both structures, unusually high coordination numbers are found for the transition metal cations, with ninefold coordinated Hf4+, and tenfold coordinated Zr4+, respectively. These findings remarkably show the potential of cold compression as a low‐energy pathway to discover metastable structures that exhibit new coordinations and structural motifs.
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Affiliation(s)
- Anna Pakhomova
- Deutsches Elektronen-Synchrotron (DESY), Petra III, Notkestraße 85, 22607, Hamburg, Germany
| | - Birgit Fuchs
- Institut für Allgemeine, Anorganische und Theoretische Chemie, University of Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria
| | - Leonid S Dubrovinsky
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
| | - Natalia Dubrovinskaia
- Material Physics and Technology at Extreme Conditions, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany.,Department of Physics, Chemistry and Biology (IFM), Linköping University, 581 83, Linköping, Sweden
| | - Hubert Huppertz
- Institut für Allgemeine, Anorganische und Theoretische Chemie, University of Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria
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Borisov SV, Magarill SA, Pervukhina NV. CRYSTALLOGRAPHIC ANALYSIS OF PHASE TRANSFORMATIONS IN DANBURITE CaSi2B2O8. J STRUCT CHEM+ 2020. [DOI: 10.1134/s0022476620070070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Abstract
Feldspars are rock-forming minerals that make up most of the Earth’s crust. Along the mantle geotherm, feldspars are stable at pressures up to 3 GPa and may persist metastably at higher pressures under cold conditions. Previous structural studies of feldspars are limited to ~10 GPa, and have shown that the dominant mechanism of pressure-induced deformation is the tilting of AlO4 and SiO4 tetrahedra in a tetrahedral framework. Herein, based on results of in situ single-crystal X-ray diffraction studies up to 27 GPa, we report the discovery of new high-pressure polymorphs of the feldspars anorthite (CaSi2Al2O8), albite (NaAlSi3O8), and microcline (KAlSi3O8). The phase transitions are induced by severe tetrahedral distortions, resulting in an increase in the Al and/or Si coordination number. High-pressure phases derived from feldspars could persist at depths corresponding to the Earth upper mantle and could possibly influence the dynamics and fate of cold subducting slabs. Feldspars are stable at pressures up to 3 GPa along the mantle geotherm, but they can persist metastably at higher pressures at colder conditions. Here, above 10 GPa the authors find new high-pressure polymorphs of feldspars that could persist at depths corresponding to the Earth’s upper mantle, potentially influencing the dynamics and fate of cold subducting slabs.
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A High-Pressure Investigation of the Synthetic Analogue of Chalcomenite, CuSeO3∙2H2O. CRYSTALS 2019. [DOI: 10.3390/cryst9120643] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Synthetic chalcomenite-type cupric selenite CuSeO3∙2H2O has been studied at room temperature under compression up to pressures of 8 GPa by means of single-crystal X-ray diffraction, Raman spectroscopy, and density-functional theory. According to X-ray diffraction, the orthorhombic phase undergoes an isostructural phase transition at 4.0(5) GPa with the thermodynamic character being first-order. This conclusion is supported by Raman spectroscopy studies that have detected the phase transition at 4.5(2) GPa and by the first-principles computing simulations. The structure solution at different pressures has provided information on the change with pressure of unit–cell parameters as well as on the bond and polyhedral compressibility. A Birch–Murnaghan equation of state has been fitted to the unit–cell volume data. We found that chalcomenite is highly compressible with a bulk modulus of 42–49 GPa. The possible mechanism driving changes in the crystal structure is discussed, being the behavior of CuSeO3∙2H2O mainly dominated by the large compressibility of the coordination polyhedron of Cu. On top of that, an assignation of Raman modes is proposed based upon density-functional theory and the pressure dependence of Raman modes discussed. Finally, the pressure dependence of phonon frequencies experimentally determined is also reported.
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Gorelova LA, Pakhomova AS, Krivovichev SV, Dubrovinsky LS, Kasatkin AV. High pressure phase transitions of paracelsian BaAl 2Si 2O 8. Sci Rep 2019; 9:12652. [PMID: 31477776 PMCID: PMC6718520 DOI: 10.1038/s41598-019-49112-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 08/19/2019] [Indexed: 11/24/2022] Open
Abstract
Three new polymorphs of aluminosilicate paracelsian, BaAl2Si2O8, have been discovered using synchrotron-based in situ high-pressure single crystal X-ray diffraction. The first isosymmetric phase transition (from paracelsian-I to paracelsian-II) occurs between 3 and 6 GPa. The phase transition is associated with the formation of pentacoordinated Al3+ and Si4+ ions, which occurs in a stepwise fashion by sequential formation of Al-O and Si-O bonds additional to those in AlO4 and SiO4 tetrahedra, respectively. The next phase transition occurs between 25 and 28 GPa and is accompanied by the symmetry change from monoclinic (P21/c) to orthorhombic (Pna21). The structure of paracelsian-III consists of SiO6 octahedra, AlO6 octahedra and distorted AlO4 tetrahedra, i.e. the transition is reconstructive and associated with the changes of Si4+ and Al3+ coordination, which show rather complex behaviour with the general tendency towards increasing coordination numbers. The third phase transition is observed between 28 and 32 GPa and results in the symmetry decreasing from Pna21 to Pn. The transition has a displacive character. In the course of the phase transformation pathway up to 32 GPa, the structure of polymorphs becomes denser: paracelsian-II is based upon elements of cubic and hexagonal close-packing arrangements of large O2− and Ba2+ ions, whereas, in the crystal structure of paracelsian-III and IV, this arrangement corresponds to 9-layer closest-packing with the layer sequence ABACACBCB.
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Affiliation(s)
- Liudmila A Gorelova
- Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, University Emb. 7/9, 199034, Saint Petersburg, Russia.
| | - Anna S Pakhomova
- Deutsches Elektronen-Synchrotron (DESY), Petra III, Notkestraße 85, 22607, Hamburg, Germany
| | - Sergey V Krivovichev
- Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, University Emb. 7/9, 199034, Saint Petersburg, Russia.,Kola Science Centre, Russian Academy of Sciences, Fersman str. 14, 184209, Apatity, Russia
| | - Leonid S Dubrovinsky
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstraße 30, 95447, Bayreuth, Germany
| | - Anatoly V Kasatkin
- Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninskiy pr. 18, 2, 119071, Moscow, Russia
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Penta- and hexa-coordinated beryllium and phosphorus in high-pressure modifications of CaBe 2P 2O 8. Nat Commun 2019; 10:2800. [PMID: 31243286 PMCID: PMC6594954 DOI: 10.1038/s41467-019-10589-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 05/08/2019] [Indexed: 11/23/2022] Open
Abstract
Beryllium oxides have been extensively studied due to their unique chemical properties and important technological applications. Typically, in inorganic compounds beryllium is tetrahedrally coordinated by oxygen atoms. Herein based on results of in situ single crystal X-ray diffraction studies and ab initio calculations we report on the high-pressure behavior of CaBe2P2O8, to the best of our knowledge the first compound showing a step-wise transition of Be coordination from tetrahedral (4) to octahedral (6) through trigonal bipyramidal (5). It is remarkable that the same transformation route is observed for phosphorus. Our theoretical analysis suggests that the sequence of structural transitions of CaBe2P2O8 is associated with the electronic transformation from predominantly molecular orbitals at low pressure to the state with overlapping electronic clouds of anions orbitals. Beryllium in inorganic compounds is usually coordinated to four oxygen atoms, but higher coordination numbers have been predicted. Here the authors observe a pressure induced stepwise transition in CaBe2P2O8 where Be coordination changes to trigonal-bipyramidal and octahedral, implying that d orbitals are not mandatory for high coordination.
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Dal Bo F, Aksenov SM, Burns PC. Mg[(UO2)2(Ge2O6(OH)2]·(H2O)4.4, a novel compound with mixed germanium coordination: cation disordering and topological features of β-U3O8 type sheets. Z KRIST-CRYST MATER 2019. [DOI: 10.1515/zkri-2018-2156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
A novel hydrated magnesium uranyl germanate, Mg[(UO2)2(Ge2O6(OH)2)]·(H2O)4.4, has been synthesized under hydrothermal conditions at 200 °C. The orthorhombic unit-cell parameters are a=10.829(6), b=7.625(4), c=16.888(10) Å, V=1394.5(1) Å3, space group Cmcm, Z=4. The crystal structure is based on β-U3O8-type sheets of corner- and edge-sharing U6+O7 pentagonal bipyramids. The GeO3(OH) tetrahedra and GeO4(OH) trigonal bipyramids are linked to form [Ge2φ8] diortho groups that fill the hexagonal-shaped windows within the sheets. The uranyl germanate layers are connected through Mgφ6 octahedra. The disorder of the [Ge2φ8] diortho groups leads to different local structure types with layered- and framework-like characters. A review of the crystal structures of uranyl minerals and actinide-bearing synthetic compounds based on β-U3O8 topological-type sheets is provided. Structural complexity parameters (I
G,total=176.19 bits/unit cell) indicate that the title compound is one of the simplest actinyl compounds among this family.
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Affiliation(s)
- Fabrice Dal Bo
- Department of Civil and Environmental Engineering and Earth Sciences , University of Notre Dame , Notre Dame, Indiana 46556 , USA
| | - Sergey M. Aksenov
- Department of Civil and Environmental Engineering and Earth Sciences , University of Notre Dame , Notre Dame, Indiana 46556 , USA
| | - Peter C. Burns
- Department of Civil and Environmental Engineering and Earth Sciences , University of Notre Dame , Notre Dame, Indiana 46556 , USA
- Department of Chemistry and Biochemistry , University of Notre Dame , Notre Dame, Indiana 46556 , USA
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Bykova E, Bykov M, Černok A, Tidholm J, Simak SI, Hellman O, Belov MP, Abrikosov IA, Liermann HP, Hanfland M, Prakapenka VB, Prescher C, Dubrovinskaia N, Dubrovinsky L. Metastable silica high pressure polymorphs as structural proxies of deep Earth silicate melts. Nat Commun 2018; 9:4789. [PMID: 30442940 PMCID: PMC6237875 DOI: 10.1038/s41467-018-07265-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 10/19/2018] [Indexed: 11/24/2022] Open
Abstract
Modelling of processes involving deep Earth liquids requires information on their structures and compression mechanisms. However, knowledge of the local structures of silicates and silica (SiO2) melts at deep mantle conditions and of their densification mechanisms is still limited. Here we report the synthesis and characterization of metastable high-pressure silica phases, coesite-IV and coesite-V, using in situ single-crystal X-ray diffraction and ab initio simulations. Their crystal structures are drastically different from any previously considered models, but explain well features of pair-distribution functions of highly densified silica glass and molten basalt at high pressure. Built of four, five-, and six-coordinated silicon, coesite-IV and coesite-V contain SiO6 octahedra, which, at odds with 3rd Pauling's rule, are connected through common faces. Our results suggest that possible silicate liquids in Earth's lower mantle may have complex structures making them more compressible than previously supposed.
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Affiliation(s)
- E Bykova
- Photon Sciences, Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607, Hamburg, Germany.
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany.
| | - M Bykov
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
- Materials Modeling and Development Laboratory, National University of Science and Technology 'MISIS', Leninsky Avenue 4, 119049, Moscow, Russia
| | - A Černok
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
| | - J Tidholm
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83, Linköping, Sweden
| | - S I Simak
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83, Linköping, Sweden
| | - O Hellman
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83, Linköping, Sweden
- Department of Applied Physics and Materials Science, California Institute of Technology, 1200 East California Boulevard, Pasadena, California, 91125, USA
| | - M P Belov
- Materials Modeling and Development Laboratory, National University of Science and Technology 'MISIS', Leninsky Avenue 4, 119049, Moscow, Russia
| | - I A Abrikosov
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83, Linköping, Sweden
| | - H-P Liermann
- Photon Sciences, Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607, Hamburg, Germany
| | - M Hanfland
- European Synchrotron Radiation Facility (ESRF), 6 Rue Jules Horowitz, 38000, Grenoble, France
| | - V B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois, 60637, USA
| | - C Prescher
- Center for Advanced Radiation Sources, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois, 60637, USA
- Institute of Geology and Mineralogy, Universität zu Köln, Zülpicher Straße 49b, 50674, Köln, Germany
| | - N Dubrovinskaia
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
| | - L Dubrovinsky
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
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Gorelova LA, Pakhomova AS, Aprilis G, Dubrovinsky LS, Krivovichev SV. Pentacoordinated silicon in the high-pressure modification of datolite, CaBSiO 4(OH). Inorg Chem Front 2018. [DOI: 10.1039/c8qi00257f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new modification of borosilicate datolite, CaBSiO4(OH), has been discovered using synchrotron-basedin situhigh-pressure single-crystal X-ray diffraction.
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Affiliation(s)
- Liudmila A. Gorelova
- Department of Crystallography
- Institute of Earth Sciences
- St Petersburg State University
- 199034 St Petersburg
- Russia
| | - Anna S. Pakhomova
- Deutsches Elektronen-Synchrotron (DESY)
- Petra III
- 22607 Hamburg
- Germany
| | - Georgios Aprilis
- Materials Physics and Technology at Extreme Conditions
- Laboratory of Crystallography
- University of Bayreuth
- 95440 Bayreuth
- Germany
| | | | - Sergey V. Krivovichev
- Department of Crystallography
- Institute of Earth Sciences
- St Petersburg State University
- 199034 St Petersburg
- Russia
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