Raman study of tetragonal TbPO4 and observation of a first-order phase transition at high pressure

A. Tatsi, E. Stavrou, Y. C. Boulmetis, A. G. Kontos, Y. S. Raptis, C. Raptis*

*Corresponding author for this work

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30 Scopus citations

Abstract

The Raman spectra of tetragonal TbPO4 (zircon-type I4 1/amd structure, D4h19 space group) have been measured at ambient conditions and under variable pressure up to 15.5GPa inside a diamond anvil cell (DAC). Assignment of the Raman active modes of the tetragonal phase has been carried out based on polarized measurements from a single oriented crystal of TbPO4 at ambient conditions. The abrupt Raman mode discontinuities and the appearance of numerous new Raman peaks at a pressure Pc≈9.5GPa have provided strong evidence for a first-order phase transition to a lower crystal symmetry, most likely monoclinic. The high-pressure structure appears to be more compact compared to the tetragonal one, and is retained upon bringing the crystal to ambient pressure.

Original languageEnglish
Article number425216
JournalJournal of Physics Condensed Matter
Volume20
Issue number42
DOIs
StatePublished - 22 Oct 2008
Externally publishedYes

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