Model for an anti-isostructural phase transition coupled with ordering
V. L. KovarskiĭPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetsA. V. Leont’evaPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetsB. Ya. SukharevskiǐPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Donets
ABI
Abstract
We consider the possible existence of a cubic invariant in the Landau potential for an interstitial alloy (a binary alloy consisting of particles and “holes”). Using the example of a three-sublattice planar triangular lattice in the Bragg–Williams approximation, we study the role of three-particle interactions in the formation of an anti-isostructural phase. We present the results of numerical calculations for the phase diagram of the model and the temperature dependence of the order parameter. We suggest a possible realization of the situation considered in solid hydrogen.
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