Pressure-Induced Phase Transitions of KTiOAsO4 by Raman Spectroscopy.

• Shen Z. X.

  Department of Physics, National University of Singapore

• Wang X. B.

  Department of Physics, National University of Singapore

• Li H. P.

  Division of Physics. School of Science, Nanyang Technological University

• Tang S. H.

  Department of Physics, National University of Singapore

• Zhou F.

  Division of Physics. School of Science, Nanyang Technological University

Bibliographic Information

Other Title

• Pressure-Induced Phase Transitions of K

Abstract

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.

Journal

• 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

Keywords

• KTiOAsO<SUB>4</SUB>
• high pressure
• micro-Raman
• phase transitions
• ferroelectric

Details

• CRID: 1390001204380658944
• NII Article ID: 10002691714
• NII Book ID: AN10452913
• DOI: 10.4131/jshpreview.7.748
• ISSN: 13481940
• ISSN: 0917639X
• NDL BIB ID: 4494043
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4494043
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed