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

doi:10.1088/0953-8984/20/42/425216

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

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

The Raman spectra of tetragonal TbPO₄ (zircon-type I4 ₁/amd structure, D_4h¹⁹ 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 P_c≈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 language	English
Article number	425216
Journal	Journal of Physics Condensed Matter
Volume	20
Issue number	42
DOIs	https://doi.org/10.1088/0953-8984/20/42/425216
State	Published - 22 Oct 2008
Externally published	Yes

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

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.",

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T1 - Raman study of tetragonal TbPO4 and observation of a first-order phase transition at high pressure

AU - Tatsi, A.

AU - Stavrou, E.

AU - Boulmetis, Y. C.

AU - Kontos, A. G.

AU - Raptis, Y. S.

AU - Raptis, C.

PY - 2008/10/22

Y1 - 2008/10/22

N2 - 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.

AB - 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.

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DO - 10.1088/0953-8984/20/42/425216

M3 - 文章

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

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