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Structural and Electronic Transitions in AgReO4 Under Pressure

Published online by Cambridge University Press:  28 February 2011

John K. Vassiliou ,
Jens W. Otto ,
Richard F. Porter  and
Arthur L. Ruoff
Jens W. Otto
Affiliation:
Cornell University, Materials Science Center, Ithaca, NY 14853.
Richard F. Porter
Affiliation:
Cornell University, Materials Science Center, Ithaca, NY 14853.
Arthur L. Ruoff
Affiliation:
Cornell University, Materials Science Center, Ithaca, NY 14853.
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Abstract

The behavior of AgReO4 under pressure has been studied in a diamond anvil cell. The equation of state determined by synchrotron radiation shows considerable change in compressibility with increasing pressure. X-ray and Raman scattering show a first-order phase transition from the scheelite to an as yet undetermined structure at 13 GPa. Changes in both the internal and external Raman active modes suggest a change in Re coordination. Optical transmission experiments demonstrate that the energy gap in the scheelitephase decreases at the rate of 75 meV/GPa. There is a small jump in the energy gap at 13 GPa, probably related to the structural transition. AgReO4 remains aninsulator to at least 47 GPa.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 210: Symposium L – Solid State Ionics II , 1990 , 627
Copyright
Copyright © Materials Research Society 1991

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