Pressure-Induced Phase Transitions of KTiOAsO_4 by Raman Spectroscopy
Access this Article
Search this Article
Potassium titanyl orthoarsenate KTiOAsO<SUB>4</SUB> 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 TiO<SUB>6</SUB> octahedra. The second phase transition occurs at 7. 5 GPa with striking spectral changes in the high wavenumber region for Raman modes involving both TiO<SUB>6</SUB> and AsO<SUB>4</SUB> groups. Several modes belonging to TiO<SUB>6</SUB> 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.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 748-750, 1998
The Japan Society of High Pressure Science and Technology