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Flosbach NT, Bykov M, Bykova E, Rasche B, Mezouar M, Fedotenko T, Chariton S, Prakapenka VB, Wickleder MS. Stabilization of Pr 4+ in Silicates─High-Pressure Synthesis of PrSi 3O 8 and Pr 2Si 7O 18. Inorg Chem 2024; 63:4875-4882. [PMID: 38412505 DOI: 10.1021/acs.inorgchem.3c03948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
The reaction between PrO2 and SiO2 was investigated at various pressure points up to 29 GPa in a diamond anvil cell using laser heating and in situ single-crystal structure analysis. The pressure points at 5 and 10 GPa produced Pr2III(Si2O7), whereas Pr4IIISi3O12 and Pr2IV(O2)O3 were obtained at 15 GPa. Pr4IIISi3O12 can be interpreted as a high-pressure modification of the still unknown orthosilicate Pr4III(SiO4)3. PrIVSi3O8 and Pr2IVSi7O18 that contain praseodymium in its rare + IV oxidation state were identified at 29 GPa. After the pressure was released from the reaction chamber, the Pr(IV) silicates could be recovered, indicating that they are metastable at ambient pressure. Density functional theory calculations of the electronic structure corroborate the oxidation state of praseodymium in both PrIVSi3O8 and Pr2IVSi7O18. Both silicates are the first structurally characterized representatives of Pr4+-containing salts with oxoanions. All three silicates contain condensed networks of [SiO6] octahedra which is unprecedented in the rich chemistry of lanthanoid silicates.
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Affiliation(s)
- Niko T Flosbach
- Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
| | - Maxim Bykov
- Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
- Institute of Inorganic and Analytical Chemistry, Goethe University Frankfurt, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany
| | - Elena Bykova
- Institute of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
| | - Bertold Rasche
- Institute of Inorganic Chemistry, University of Stuttgart, 70569 Stuttgart, Germany
| | - Mohamed Mezouar
- European Synchrotron Radiation Facility (ESRF), Avenue des Martyrs 71, 38000 Grenoble, France
| | - Timofey Fedotenko
- Deutsches Elektronen-Synchrotron, Notkestr. 85, 22607 Hamburg, Germany
| | - Stella Chariton
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, United States
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, United States
| | - Mathias S Wickleder
- Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
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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: 0.3] [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: 0.8] [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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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: 1.0] [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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