Pressure induced phase transitions in spinel and wurtzite phases of ZnAl2S4 compound

Ursaki, VV; Burlakov, II; Tiginyanu, IM; Raptis, YS; Anastassakis, E; Aksenov, I; Sato, K

dc.contributor.author	Ursaki, VV	en
dc.contributor.author	Burlakov, II	en
dc.contributor.author	Tiginyanu, IM	en
dc.contributor.author	Raptis, YS	en
dc.contributor.author	Anastassakis, E	en
dc.contributor.author	Aksenov, I	en
dc.contributor.author	Sato, K	en
dc.date.accessioned	2014-03-01T01:14:04Z
dc.date.available	2014-03-01T01:14:04Z
dc.date.issued	1998	en
dc.identifier.issn	0021-4922	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12851
dc.subject	High-pressure	en
dc.subject	Phase transitions	en
dc.subject	Pressure-induced amorphization	en
dc.subject	Raman spectroscopy	en
dc.subject	Spinel	en
dc.subject	Wurtzite	en
dc.subject	ZnAl2S4	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	TETRAHEDRALLY-BONDED MATERIALS	en
dc.subject.other	RAY-ABSORPTION SPECTROSCOPY	en
dc.subject.other	OPTICAL-ABSORPTION	en
dc.subject.other	RAMAN-SCATTERING	en
dc.subject.other	SEMICONDUCTORS	en
dc.subject.other	AMORPHIZATION	en
dc.subject.other	SPECTRA	en
dc.title	Pressure induced phase transitions in spinel and wurtzite phases of ZnAl2S4 compound	en
heal.type	journalArticle	en
heal.identifier.primary	10.1143/JJAP.37.135	en
heal.identifier.secondary	http://dx.doi.org/10.1143/JJAP.37.135	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	ZnAl2S4 single crystals with spinel (alpha-phase) and wurtzite (w-phase) structures have been studied by Raman spectroscopy under hydrostatic pressures of up to 300 kbar. Significant changes in the phonon spectrum of the ct-phase have been observed at the critical pressure of 230 kbar, which are attributed to a reversible phase transition to a denser high-pressure phase, having a similar structure to that of calcium ferrite. In the pressure interval of 180 to 230 kbar, the two phases coexist. The irreversible disappearance of the Raman signal of w-ZnAl2S4 doped by Cd at pressures above 90 kbar was attributed to a phase transition to a rocksalt-type structure. This critical pressure is 40kbar lower than that in undoped w-ZnAl2S4 and is explained on the basis of crystal structure quality. Different structures were realized upon removing the pressure, depending on the highest pressure previously reached, such as a mixture of wurtzite and spinel phases, a spinel quasi-crystalline structure, or a pressure-induced amorphous phase. The behavior of the quasi-crystalline spinel structure upon repeating the pressure cycle was found to be different from that of the ct-phase single crystal.	en
heal.publisher	JAPAN J APPLIED PHYSICS	en
heal.journalName	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers	en
dc.identifier.doi	10.1143/JJAP.37.135	en
dc.identifier.isi	ISI:000071972400031	en
dc.identifier.volume	37	en
dc.identifier.issue	1	en
dc.identifier.spage	135	en
dc.identifier.epage	140	en