High pressure Raman spectroscopic study of spinel MgCr2O4

Z. Wang; H. S.C. O'Neill; P. Lazor; S. K. Saxena

doi:10.1016/S0022-3697(02)00194-4

High pressure Raman spectroscopic study of spinel MgCr₂O₄

Z. Wang^*, H. S.C. O'Neill, P. Lazor, S. K. Saxena

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

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 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.

Original language	English
Pages (from-to)	2057-2061
Number of pages	5
Journal	Journal of Physics and Chemistry of Solids
Volume	63
Issue number	11
DOIs	https://doi.org/10.1016/S0022-3697(02)00194-4
Publication status	Published - Nov 2002

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abstract = "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 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.",

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T1 - High pressure Raman spectroscopic study of spinel MgCr2O4

AU - Wang, Z.

AU - O'Neill, H. S.C.

AU - Lazor, P.

AU - Saxena, S. K.

PY - 2002/11

Y1 - 2002/11

N2 - 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 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.

AB - 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 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.

KW - A. Ceramics

KW - C. Raman spectroscopy

KW - C. X-ray diffraction

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DO - 10.1016/S0022-3697(02)00194-4

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EP - 2061

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

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ER -

High pressure Raman spectroscopic study of spinel MgCr₂O₄

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