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Models of Long-Period Superstructures

Published online by Cambridge University Press:  21 February 2011

J. Kulik  and
D. de Fontaine
J. Kulik
Affiliation:
Lawrence Berkeley Laboratory, Materials and Molecular Research Division,University of California, Berkeley, California 94720, U.S.A.
D. de Fontaine
Affiliation:
Lawrence Berkeley Laboratory, Materials and Molecular Research Division,University of California, Berkeley, California 94720, U.S.A.
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Abstract

The cause of the stability of long period superstructures is still something of a mystery. Typically, two very different models have been proposed: according to model I, the period of the superstructure (or modulation) is determined by lowering of the electronic energy resulting from the formation of a new Brillouin zone. According to model II, competing short-range interactions tend to produce long-period structures, the wavelength of which is determined by configurational entropy considerations. Model I is exemplified by the Sato and Toth theory, apparently applicable to long-period superstructures in Cu-Au, for example. Model II is exemplified by the Axial Next Nearest Neighbor Ising Model, for which a low-temperature free energy expansion has recently been given by Fisher and Selke. The latter model appears to apply to long-period superstructures in Ag3Mg.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 21: Symposium GREECE – Phase Transformations in Solids , 1983 , 225
Copyright
Copyright © Materials Research Society 1984

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References

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