Pressure-induced phase transitions of KTiOAsO4 by Raman spectroscopy
Potassium titanyl orthoarsenate KTiOAsO4 has been studied by Raman spectroscopy up to 16 GPa. Three first-order pressure-induced phase transitions are inferred from Raman data. The first phase transition takes place at 3. 2 GPa, as indicated by drastic spectral changes in all the internal modes of t...
| Main Authors: | , , , , |
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| Outros autores: | |
| Formato: | Journal Article |
| Idioma: | English |
| Publicado: |
2018
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| Subjects: | |
| Acceso en liña: | https://hdl.handle.net/10356/89270 http://hdl.handle.net/10220/46156 |
| Summary: | Potassium titanyl orthoarsenate KTiOAsO4 has been studied by Raman spectroscopy up to 16 GPa. Three first-order pressure-induced phase transitions are inferred from Raman data. The first phase transition takes place at 3. 2 GPa, as indicated by drastic spectral changes in all the internal modes of the TiO6 octahedra. The second phase transition occurs at 7. 5 GPa with striking spectral changes in the high wavenumber region for Raman modes involving both TiO6 and AsO4 groups. Several modes belonging to TiO6 also soften between 0-7. 5 GPa. The third phase transition occurs near 10 GPa and the high-pressure phase should be of higher symmetry. |
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