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Novel Structure of MgSe in the Multimegabar Regime: Positional Parameter Determination

Published online by Cambridge University Press:  10 February 2011

Arthur L. Ruoff ,
Ting Li ,
Chandrabhas Narayana ,
Huan Luo  and
Raymond G. Greene
Arthur L. Ruoff
Affiliation:
Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853
Ting Li
Affiliation:
Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX 78712.
Chandrabhas Narayana
Affiliation:
Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853
Huan Luo
Affiliation:
Applied Materials Inc., Santa Clara, CA 95054
Raymond G. Greene
Affiliation:
Rainbow Displays Inc., New York.
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Abstract

The structural transformations in the II-VI compound MgSe have been studied under pressure using energy dispersive x-ray diffraction. MgSe transforms ‘continuously’ from the rocksalt (Bl) structure to a FeSi (B28) or Au-Be structure beginning at 99 ± 8 GPa. At 202 GPa, MgSe is approaching 7-fold coordination with u = 0.0828 and w = 0.4173. The method for intensity calculation of the diffraction peaks is presented. Using the Birch equation, the equation of state to 146 GPa was determined with Bo = 62.8 + 1.6 GPa and Bo′ = 4.1.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 499: Symposium DD – High Pressure Materials Research , 1997 , 429
Copyright
Copyright © Materials Research Society 1998

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References

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