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Title: Diffusionless first-order phase transitions in systems with frozen configurational degrees of freedom
Author: Planes Vila, Antoni
Vives i Santa-Eulàlia, Eduard
Castán i Vidal, Maria Teresa
Keywords: Transformacions de fase (Física estadística)
Transformacions martensítiques
Mecànica estadística
Phase transformations (Statistical physics)
Martensitic transformations
Statistical mechanics
Issue Date: 1991
Publisher: The American Physical Society
Abstract: We consider systems that can be described in terms of two kinds of degree of freedom. The corresponding ordering modes may, under certain conditions, be coupled to each other. We may thus assume that the primary ordering mode gives rise to a diffusionless first-order phase transition. The change of its thermodynamic properties as a function of the secondary-ordering-mode state is then analyzed. Two specific examples are discussed. First, we study a three-state Potts model in a binary system. Using mean-field techniques, we obtain the phase diagram and different properties of the system as a function of the distribution of atoms on the different lattice sites. In the second case, the properties of a displacive structural phase transition of martensitic type in a binary alloy are studied as a function of atomic order. Because of the directional character of the martensitic-transition mechanism, we find only a very weak dependence of the entropy on atomic order. Experimental results are found to be in quite good agreement with theoretical predictions.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 1991, vol. 44, núm. 13, p. 6715-6722.
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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