Pressure-induced structural phase transitions in bismuth tungstate Bi2WO6
| Autor: | Subramanian Balakumar, Olga N. Lis, Sergey E. Kichanov, D. P. Kozlenko, N.M. Belozerova, E. V. Lukin, B. N. Savenko |
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| Rok vydání: | 2021 |
| Předmět: |
Phase transition
Neutron diffraction Metals and Alloys chemistry.chemical_element Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Bismuth Crystal chemistry.chemical_compound symbols.namesake Crystallography Tungstate chemistry Phase (matter) Materials Chemistry symbols Orthorhombic crystal system Raman spectroscopy |
| Zdroj: | Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials. 77:488-494 |
| ISSN: | 2052-5206 |
| Popis: | The pressure-induced structural phase transitions in bismuth tungstate Bi2WO6 have been studied using neutron diffraction and Raman spectroscopy at high pressures up to 7 and 30 GPa, respectively. A rich structural polymorphism was revealed. At P ≃ 3.5 GPa a phase transition from the initial orthorhombic phase of P21 ab symmetry to an orthorhombic phase of B2cb symmetry was observed. This transition is caused by the complex spatial rotation of the WO6 octahedra. A subsequent isostructural phase transition to another orthorhombic phase of B2cb symmetry was detected at P ≃ 5.9 GPa, accompanied by changes in both the mutual rotation and tilting of the oxygen octahedra with respect to the crystal b axis. Two more pressure-induced phase transitions in Bi2WO6 at high pressures of 11.5 and 20 GPa were observed in the Raman spectra. These pressure-driven phase transitions in bismuth tungstate are accompanied by anomalies in the pressure dependences of the unit-cell parameters, bond lengths and angles, and in the vibrational modes. |
| Databáze: | OpenAIRE |
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