Pressure-induced amorphization of germanium diselenide

• Published in: Journal of non-crystalline solids Vol. 227; pp. 794 - 798
• Main Authors: Popovic, Z.V., Raptis, Y.S., Anastassakis, E., Jaksic, Z.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.1998
• Subjects: Amorphization; Raman scattering spectra; β-GeSe 2 single crystal; Raman scattering spectra; 62.50.+p; 78.30.Hv; P320; C140; Amorphization; A170; 61.50.Ks; β-GeSe 2 single crystal
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/S0022-3093(98)00172-0

We have measured the Raman scattering spectra of β-GeSe 2 single crystal (high-temperature modification with layered crystal structure) under hydrostatic pressures to 12.5 GPa at room temperature. According to the Raman spectra, the pressure increase produces transformation of the layered crystal structure into a fully disordered structure (at 6.2 GPa). A further increase of the pressure to 7 GPa yields indications of a phase transition from the disordered phase to the α-GeSe 2 (low-temperature modification of GeSe 2 with three dimensional crystal structure). At 8 GPa, this modification transforms back to the disordered phase. Reversibility of the phase changes, upon releasing the pressure, depends on the maximum pressure.