Pressure-induced phase transitions of KTiOAsO4 by Raman spectroscopy
Shen, Z. X.
Wang, X. B.
Li, H. P.
Tang, S. H.
Date of Issue1998
School of Physical and Mathematical Sciences
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.
Review of High Pressure Science and Technology
© 1998 The Japan Society of High Pressure Science and Technology. This paper was published in Review of High Pressure Science and Technology and is made available as an electronic reprint (preprint) with permission of The Japan Society of High Pressure Science and Technology. The published version is available at: [http://dx.doi.org/10.4131/jshpreview.7.748]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law."