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High pressure Raman spectroscopic study of spinel MgCr 2 O 4

Wang, Z; O'Neill, Hugh; Lazor, P; Saxena, S.K.

Description

An in situ Raman spectroscopic study was conducted to investigate the pressure induced phase transformation of MgCr2O4 spinel up to pressures of 76.4 GPa. Results indicate that MgCr2O4 spinel undergoes a phase transformation to the CaFe2O4 (or CaTi2O4) structure at 14.2 GPa, and this transition is complete at 30.1 GPa. The coexistence of two phases over a wide range of pressure implies a sluggish transition mechanism. No evidence was observed to support the pressure-induced dissociation of...[Show more]

dc.contributor.authorWang, Z
dc.contributor.authorO'Neill, Hugh
dc.contributor.authorLazor, P
dc.contributor.authorSaxena, S.K.
dc.date.accessioned2015-12-13T22:24:46Z
dc.identifier.issn0022-3697
dc.identifier.urihttp://hdl.handle.net/1885/72893
dc.description.abstractAn in situ Raman spectroscopic study was conducted to investigate the pressure induced phase transformation of MgCr2O4 spinel up to pressures of 76.4 GPa. Results indicate that MgCr2O4 spinel undergoes a phase transformation to the CaFe2O4 (or CaTi2O4) structure at 14.2 GPa, and this transition is complete at 30.1 GPa. The coexistence of two phases over a wide range of pressure implies a sluggish transition mechanism. No evidence was observed to support the pressure-induced dissociation of MgCr2O4 at 5.7-18.8 GPa, predicted by the theoretical simulation. This high pressure MgCr2O4 polymorphism remains stable upon release of pressure, but at ambient conditions, it transforms to the spinel phase.
dc.publisherPergamon-Elsevier Ltd
dc.sourceJournal of Physics and Chemistry of Solids
dc.subjectKeywords: Ceramic materials; Dissociation; High pressure effects; Phase transitions; Raman spectroscopy; X ray diffraction analysis; Spinel phases; Magnesium compounds A. Ceramics; C. Raman spectroscopy; C. X-ray diffraction
dc.titleHigh pressure Raman spectroscopic study of spinel MgCr 2 O 4
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume63
dc.date.issued2002
local.identifier.absfor040306 - Mineralogy and Crystallography
local.identifier.ariespublicationMigratedxPub3473
local.type.statusPublished Version
local.contributor.affiliationWang, Z, Florida State University
local.contributor.affiliationO'Neill, Hugh, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationLazor, P, Florida State University
local.contributor.affiliationSaxena, S.K., Florida State University
local.description.embargo2037-12-31
local.bibliographicCitation.issue11
local.bibliographicCitation.startpage2057
local.bibliographicCitation.lastpage2061
local.identifier.doi10.1016/S0022-3697(02)00194-4
dc.date.updated2015-12-11T08:09:53Z
local.identifier.scopusID2-s2.0-0036836960
CollectionsANU Research Publications

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