Raman study of zircon-structured RPO4 (R = Y, Tb, Er, Tm) phosphates at high pressures

E. Stavrou; A. Tatsi; E. Salpea; Y. C. Boulmetis; A. G. Kontos; Y. S. Raptis; C. Raptis

doi:10.1088/1742-6596/121/4/042016

Raman study of zircon-structured RPO₄ (R = Y, Tb, Er, Tm) phosphates at high pressures

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

Research output: Contribution to journal › Conference article › peer-review

16 Scopus citations

Abstract

The Raman spectra of tetragonal RPO4 (R = Y, Tb, Er, Tm) phosphates belonging to the zircon-structure class (space group D4h¹⁹) have been measured at high pressures up to 7.9 GPa (YPO4, ErPO4) and 15.5 GPa (TbPO4, TmPO4). Most of the 12 Raman active modes of this crystal class have been observed at high pressures using a Diamond Anvil Cell. A characteristic feature in the spectra of all crystals studied is the anomalous pressure dependence of the B2g symmetry internal bending mode which softens substantially with increasing pressure to the extent that a level crossing occurs between this mode and one normal Eg rotational mode. These observations imply that an incipient structural phase transition of the crystals may occur at a higher pressure. Such a phase transition has been observed for TbPO4 at a pressure of ∼9.5 GPa. The abrupt spectral variations observed at this pressure, indicate that TbPO4 undergoes a first-order phase transition from tetragonal zircon to a lower symmetry structure which is quenchable upon pressure release.

Original language	English
Article number	042016
Journal	Journal of Physics: Conference Series
Volume	121
Issue number	PART 4
DOIs	https://doi.org/10.1088/1742-6596/121/4/042016
State	Published - 2008
Externally published	Yes
Event	Joint 21st AIRAPT and 45th EHPRG International Conference on High Pressure Science and Technology - Catania, Italy Duration: 17 Sep 2007 → 21 Sep 2007

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title = "Raman study of zircon-structured RPO4 (R = Y, Tb, Er, Tm) phosphates at high pressures",

abstract = "The Raman spectra of tetragonal RPO4 (R = Y, Tb, Er, Tm) phosphates belonging to the zircon-structure class (space group D4h19) have been measured at high pressures up to 7.9 GPa (YPO4, ErPO4) and 15.5 GPa (TbPO4, TmPO4). Most of the 12 Raman active modes of this crystal class have been observed at high pressures using a Diamond Anvil Cell. A characteristic feature in the spectra of all crystals studied is the anomalous pressure dependence of the B2g symmetry internal bending mode which softens substantially with increasing pressure to the extent that a level crossing occurs between this mode and one normal Eg rotational mode. These observations imply that an incipient structural phase transition of the crystals may occur at a higher pressure. Such a phase transition has been observed for TbPO4 at a pressure of ∼9.5 GPa. The abrupt spectral variations observed at this pressure, indicate that TbPO4 undergoes a first-order phase transition from tetragonal zircon to a lower symmetry structure which is quenchable upon pressure release.",

author = "E. Stavrou and A. Tatsi and E. Salpea and Boulmetis, {Y. C.} and Kontos, {A. G.} and Raptis, {Y. S.} and C. Raptis",

year = "2008",

doi = "10.1088/1742-6596/121/4/042016",

language = "英语",

volume = "121",

journal = "Journal of Physics: Conference Series",

issn = "1742-6588",

publisher = "IOP Publishing Ltd.",

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note = "Joint 21st AIRAPT and 45th EHPRG International Conference on High Pressure Science and Technology ; Conference date: 17-09-2007 Through 21-09-2007",

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TY - JOUR

T1 - Raman study of zircon-structured RPO4 (R = Y, Tb, Er, Tm) phosphates at high pressures

AU - Stavrou, E.

AU - Tatsi, A.

AU - Salpea, E.

AU - Boulmetis, Y. C.

AU - Kontos, A. G.

AU - Raptis, Y. S.

AU - Raptis, C.

PY - 2008

Y1 - 2008

N2 - The Raman spectra of tetragonal RPO4 (R = Y, Tb, Er, Tm) phosphates belonging to the zircon-structure class (space group D4h19) have been measured at high pressures up to 7.9 GPa (YPO4, ErPO4) and 15.5 GPa (TbPO4, TmPO4). Most of the 12 Raman active modes of this crystal class have been observed at high pressures using a Diamond Anvil Cell. A characteristic feature in the spectra of all crystals studied is the anomalous pressure dependence of the B2g symmetry internal bending mode which softens substantially with increasing pressure to the extent that a level crossing occurs between this mode and one normal Eg rotational mode. These observations imply that an incipient structural phase transition of the crystals may occur at a higher pressure. Such a phase transition has been observed for TbPO4 at a pressure of ∼9.5 GPa. The abrupt spectral variations observed at this pressure, indicate that TbPO4 undergoes a first-order phase transition from tetragonal zircon to a lower symmetry structure which is quenchable upon pressure release.

AB - The Raman spectra of tetragonal RPO4 (R = Y, Tb, Er, Tm) phosphates belonging to the zircon-structure class (space group D4h19) have been measured at high pressures up to 7.9 GPa (YPO4, ErPO4) and 15.5 GPa (TbPO4, TmPO4). Most of the 12 Raman active modes of this crystal class have been observed at high pressures using a Diamond Anvil Cell. A characteristic feature in the spectra of all crystals studied is the anomalous pressure dependence of the B2g symmetry internal bending mode which softens substantially with increasing pressure to the extent that a level crossing occurs between this mode and one normal Eg rotational mode. These observations imply that an incipient structural phase transition of the crystals may occur at a higher pressure. Such a phase transition has been observed for TbPO4 at a pressure of ∼9.5 GPa. The abrupt spectral variations observed at this pressure, indicate that TbPO4 undergoes a first-order phase transition from tetragonal zircon to a lower symmetry structure which is quenchable upon pressure release.

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DO - 10.1088/1742-6596/121/4/042016

M3 - 会议文章

AN - SCOPUS:70349640102

SN - 1742-6588

VL - 121

JO - Journal of Physics: Conference Series

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IS - PART 4

M1 - 042016

T2 - Joint 21st AIRAPT and 45th EHPRG International Conference on High Pressure Science and Technology

Y2 - 17 September 2007 through 21 September 2007

ER -

Raman study of zircon-structured RPO₄ (R = Y, Tb, Er, Tm) phosphates at high pressures

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