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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/9830
Diffusionless first-order phase transitions in systems with frozen configurational degrees of freedom
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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.
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PLANES VILA, Antoni, VIVES I SANTA-EULÀLIA, Eduard and CASTÁN I VIDAL, Maria Teresa. Diffusionless first-order phase transitions in systems with frozen configurational degrees of freedom. Physical Review B. 1991. Vol. 44, num. 13, pags. 6715-6722. ISSN 0163-1829. [consulted: 7 of June of 2026]. Available at: https://hdl.handle.net/2445/9830