Raman scattering under pressure and the phase transition in ε-GaSe

A. M. Kulibekov; H. P. Olijnyk; A. P. Jephcoat; Z. Y. Salaeva; S. Onari; K. R. Allakhverdiev

doi:10.1002/pssb.200301613

Raman scattering under pressure and the phase transition in ε-GaSe

A. M. Kulibekov, H. P. Olijnyk, A. P. Jephcoat, Z. Y. Salaeva, S. Onari, K. R. Allakhverdiev

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17 Citations (Scopus)

Abstract

Raman scattering in ε-GaSe has been investigated at room temperature in a diamond anvil cell by using helium gas as a pressure transmitting medium. The first observation of the solid-solid phase transition under pressure from a hexagonal structure at ambient pressure to a NaCl-type at around 29.2 GPa is reported. A photoinduced change in the pressurised crystal was observed. The transition under pressure was found to be irreversible at room temperature. It was shown that the pressurised form of ε-GaSe at ambient conditions most probably belongs to the γ-type as characterised by an increased intensity of the Raman modes at 234 cm^-1 and 250 cm^-1.

Original language	English
Pages (from-to)	517-520
Number of pages	4
Journal	Physica Status Solidi (B) Basic Research
Volume	235
Issue number	2
DOIs	https://doi.org/10.1002/pssb.200301613
Publication status	Published - Feb 1 2003

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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AU - Kulibekov, A. M.

AU - Olijnyk, H. P.

AU - Jephcoat, A. P.

AU - Salaeva, Z. Y.

AU - Onari, S.

AU - Allakhverdiev, K. R.

PY - 2003/2/1

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N2 - Raman scattering in ε-GaSe has been investigated at room temperature in a diamond anvil cell by using helium gas as a pressure transmitting medium. The first observation of the solid-solid phase transition under pressure from a hexagonal structure at ambient pressure to a NaCl-type at around 29.2 GPa is reported. A photoinduced change in the pressurised crystal was observed. The transition under pressure was found to be irreversible at room temperature. It was shown that the pressurised form of ε-GaSe at ambient conditions most probably belongs to the γ-type as characterised by an increased intensity of the Raman modes at 234 cm-1 and 250 cm-1.

AB - Raman scattering in ε-GaSe has been investigated at room temperature in a diamond anvil cell by using helium gas as a pressure transmitting medium. The first observation of the solid-solid phase transition under pressure from a hexagonal structure at ambient pressure to a NaCl-type at around 29.2 GPa is reported. A photoinduced change in the pressurised crystal was observed. The transition under pressure was found to be irreversible at room temperature. It was shown that the pressurised form of ε-GaSe at ambient conditions most probably belongs to the γ-type as characterised by an increased intensity of the Raman modes at 234 cm-1 and 250 cm-1.

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Raman scattering under pressure and the phase transition in ε-GaSe

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