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1993

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/9910

Vacancy-driven ordering in a two-dimensional binary alloy

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http://dx.doi.org/10.1103/PhysRevB.47.2557

Abstract

Domain growth in a system with nonconserved order parameter is studied. We simulate the usual Ising model for binary alloys with concentration 0.5 on a two-dimensional square lattice by Monte Carlo techniques. Measurements of the energy, jump-acceptance ratio, and order parameters are performed. Dynamics based on the diffusion of a single vacancy in the system gives a growth law faster than the usual Allen-Cahn law. Allowing vacancy jumps to next-nearest-neighbor sites is essential to prevent vacancy trapping in the ordered regions. By measuring local order parameters we show that the vacancy prefers to be in the disordered regions (domain boundaries). This naturally concentrates the atomic jumps in the domain boundaries, accelerating the growth compared with the usual exchange mechanism that causes jumps to be homogeneously distributed on the lattice.

Subject

Transformacions de fase (Física estadística), Termodinàmica del desequilibri, Aliatges binaris, Mètode de Montecarlo

Subject (English)

Phase transformations (Statistical physics), Nonequilibrium thermodynamics, Binary systems (Metallurgy), Monte Carlo method

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Articles publicats en revistes (Física Quàntica i Astrofísica)

Citation

VIVES I SANTA-EULÀLIA, Eduard and PLANES VILA, Antoni. Vacancy-driven ordering in a two-dimensional binary alloy. Physical Review B. 1993. Vol. 47, num. 5, pags. 2557-2562. ISSN 0163-1829. [consulted: 14 of May of 2026]. Available at: https://hdl.handle.net/2445/9910

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