Estudio teórico de las propiedades elásticas de los minerales Cu3TMSe4 (TM = V, Nb, Ta) por medio de cálculos atomísticos de primeros principios

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Carlos Mario Ruiz
Jorge M Osorio-Gillén

Keywords

propiedades elásticas, constantes elásticas, propiedades mecánicas, teoría de los funcionales de la densidad.

Resumen

Las propiedades elásticas de la familia de los minerales isoestructurales Cu3VSe4, Cu3NbSe4 y Cu3TaSe4 han sido calculadas por primera vez usandoel estado del arte en cálculos atomísticos de primeros-principios, utilizandola Teoría de los Funcionales de la Densidad y la Aproximación del Gradiente Generalizado para el funcional de la energía de intercambio-correlación. Laspropiedades elásticas calculadas son el módulo volumétrico (B), las constantes elásticas (c11, c12 y c44), el factor de anisotropía de Zener (A), el módulo de cizalladura isotrópico (G), el módulo de Young (Y), y la razón de Poisson(ν). A través de estas cantidades también hemos calculado otras propiedades termodinámicas tales como la velocidad promedio del sonido transversal (st) y longitudinal (sl) y la temperatura de Debye (ΘD). Los valores calculados de B, c11, c12 y c44, G, Y , y ν nos llevan a la conclusión que estos compuestosson compresibles, frágiles y quebradizos.

PACS: 91.60.Ba

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