Phase transitions in defect chalcopyrite compounds under hydrostatic pressure

Ursaki, VV; Burlakov, II; Tiginyanu, IM; Raptis, YS; Anastassakis, E; Anedda, A

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	Anedda, A	en
dc.date.accessioned	2014-03-01T01:15:03Z
dc.date.available	2014-03-01T01:15:03Z
dc.date.issued	1999	en
dc.identifier.issn	0163-1829	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13308
dc.subject	Hydrostatic Pressure	en
dc.subject	Phase Transition	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	TETRAHEDRALLY-BONDED MATERIALS	en
dc.subject.other	RAMAN-SPECTRA	en
dc.subject.other	SEMICONDUCTORS	en
dc.subject.other	AMORPHIZATION	en
dc.subject.other	IONICITY	en
dc.subject.other	ZINC	en
dc.subject.other	BEHAVIOR	en
dc.subject.other	ZNGA2SE4	en
dc.subject.other	SILICON	en
dc.subject.other	GALLIUM	en
dc.title	Phase transitions in defect chalcopyrite compounds under hydrostatic pressure	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevB.59.257	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevB.59.257	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	Tetrahedrally bonded AGa(2)X(4) (A = Cd, Zn; X = S, Se) compounds crystallizing in defect chalcopyrite and defect famatinite structures have been studied by Raman spectroscopy under hydrostatic pressure. The pressure-induced changes in the Raman spectra of both ordered defect chalcopyrite and partially disordered defect famatinite structures were attributed to an order-disorder phase transition in the cation sublattice, which proved to occur in two stages, as predicted by Bernard and Zunger [Phys. Rev. B 37, 6835 (1988)]. The first stage of the transition was found to depend on the tetragonal distortion of the initial crystals. An irreversible disappearance of Raman signal at elevated pressures was observed and attributed to a phase transition from the adamantine structure to a high-symmetry rocksalt-type structure. The pressure of this transition in the compounds under consideration exhibits a dependence on bond ionicity and bond length. The structure of decompressed samples was explained on the basis of pressure dependence of potential barriers for the phase transition by using a configuration-coordinate model. [S0163-1829(98)05145-5].	en
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	Physical Review B - Condensed Matter and Materials Physics	en
dc.identifier.doi	10.1103/PhysRevB.59.257	en
dc.identifier.isi	ISI:000077943800062	en
dc.identifier.volume	59	en
dc.identifier.issue	1	en
dc.identifier.spage	257	en
dc.identifier.epage	268	en