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Correlations and Ordering in (GaSb)1−xGe2x Alloys

Published online by Cambridge University Press:  26 February 2011

Kathie E. Newman ,
Bing-Lin Gu  and
P. A. Fedders
Kathie E. Newman
Affiliation:
Physics Department, University of Notre Dame, Notre Dame, Indiana 46556.
Bing-Lin Gu
Affiliation:
Physics Department, Tsinghua University, Beijing, The People's Republic of China (current address).
P. A. Fedders
Affiliation:
Physics Department, Washington University at St. Louis, St. Louis, Missouri 63130.
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Abstract

The semiconducting alloy (GaSb)1−x Ge2x is an example of a mixed crystalline alloy that undergoes a phase transition between its constituent crystal types. The order-disorder transition modifies both the long-range and short-range order in the alloy as a function of composition x. By using the Kikuchi approximation, the bond probabilities are calculated and then compared with EXAFS data. These calculations show that the EXAFS data are consistent with the existence in (GaSb)1−x Ge2x of “wrong” bonds of Ga-Ga and Sb-Sb. The theory also predicts a violation of Vegard's Law for the behavior of the mean bond length as a function of composition x.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 77: Symposium D – Interfaces, Superlattices, and Thin Films , 1986 , 59
Copyright
Copyright © Materials Research Society 1987

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