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Pressure-Induced Distortive Phase Transition in Chromite-Spinel at 29 GPa

Published online by Cambridge University Press:  26 February 2011

Jinfu Shu ,
Wendy L. Mao ,
Russell J Hemley  and
Hokwang Mao
Jinfu Shu
Affiliation:
[email protected], Carnegie Institution of Washington, Geophysical Laboratory, 5251 Broad Branch Road, NW, Washington, DC, 20015, United States
Wendy L. Mao
Affiliation:
[email protected], Los Alamos National Laboratory, LANSCE, Los Almos, NM, 87545, United States
Russell J Hemley
Affiliation:
[email protected], Carnegie Institution of Washington, Geophysical Laboratory, 5251 Broad Branch Road, NW, Washington, DC, 20015, United States
Hokwang Mao
Affiliation:
[email protected], Carnegie Institution of Washington, Geophysical Laboratory, 5251 Broad Branch Road, NW, Washington, DC, 20015, United States
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Abstract

A natural chromite single crystal was compressed in a helium pressure medium to just above 35 GPa at ambient temperature and studied with energy-dispersive x-ray diffraction. The volume compression of the cubic, spinel-type structure was fit to a third-order Birch-Murnaghan equation of state with parameters a0 = 8.338(4) Å, V0 = 579.6(9) Å3, K0 =179(10) GPa, and K' = 3.9(9) up to 29 GPa. A distortive phase transition was discovered at higher pressures to a CaAl2O4-type orthorhombic structure, with two cubic unit-cell axes increasing and the third decreasing with increasing pressure. The transition can be fit to a Landau-type strain-order formulism with approximately 5% volume decrease from the cubic phase at 35 GPa. The transition may be triggered by electronic or magnetic transitions in the 3d elements Fe and Cr cations.

Keywords

x-ray diffraction (XRD)FeCr
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 987: Symposium PP – Materials Research at High Pressure , 2006 , 0987-PP05-06
Copyright
Copyright © Materials Research Society 2007

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References

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