Pressure-Induced Amorphization of GeSe2

✍ Scribed by Andrzej Grzechnik; Tor Grande; Svein Stølen

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 306 KB
• Volume: 141
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.7975

✦ Synopsis

The high-pressure room temperature behavior of crystalline GeSe 2 is investigated with Raman scattering and energy-dispersive X-ray diffraction in a diamond anvil cell. No evidence for phase transitions to known polymorphs of GeSe 2 is observed during compression up to 11 GPa. Pressure-induced amorphization, associated with the sample becoming opaque, occurs between 11 and 14 GPa. The sample recovered to ambient conditions from 14 GPa is amorphous by X-ray diffraction. The Raman spectrum of the sample decompressed from the 11-to 14-GPa range is significantly different from the Raman spectra of glassy GeSe 2 prepared by melt quenching at atmospheric pressure. These results are discussed in relation to the possible transition from the 2 : 4 to 3 : 6 coordination during compression of AB 2 compounds with structures related to the random tetrahedral network model of amorphous GeSe 2 .