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Dislocations in cubic crystals described by discrete models


Bonilla, L.L. y Carpio, Ana y Plans, Ignacio (2007) Dislocations in cubic crystals described by discrete models. Physica A-statistical mechanics and its applications, 376 . pp. 361-377. ISSN 0378-4371

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Discrete models of dislocations in cubic crystal lattices having one or two atoms per unit cell are proposed. These models have the standard linear anisotropic elasticity as their continuum limit and their main ingredients are the elastic stiffness constants of the material and a dimensionless periodic function that restores the translation invariance of the crystal and influences the dislocation size. For these models, conservative and damped equations of motion are proposed. In the latter case, the entropy production and thermodynamic forces are calculated and fluctuation terms obeying the fluctuation-dissipation theorem are added. Numerical simulations illustrate static perfect screw and 60 degrees dislocations for GaAs and Si.

Tipo de documento:Artículo
Palabras clave:Discrete elasticity; Cubic crystals; Dislocations; Fluctuating hydrodynamics
Materias:Ciencias > Física > Termodinámica
Código ID:14951

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