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Las predicciones de la fase Pt(8) Ti en sistemas inesperados
Richard H Taylor1, Stefano Curtarolo, Gus L W Hart
1Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA.
Journal of the American Chemical Society
|April 28, 2010
Resumen
Una búsqueda de alto rendimiento predijo 59 ocurrencias de la fase A ((8) B en intermetálicos de transición binaria, expandiendo significativamente las instancias conocidas. Este enfoque computacional valida los resultados experimentales y revela nuevas posibilidades en la ciencia de los materiales.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Materiales computacionales Ciencia de la ciencia.
- Química del estado sólido.
Sus antecedentes:
- La estructura cristalina A(8) B, ejemplificada por Pt(8) Ti, es una fase intermetálica conocida.
- La observación experimental de la fase A(8) B se ha limitado a 11 sistemas binarios.
- La comprensión de la formación de la fase intermetálica es crucial para el desarrollo de nuevos materiales con las propiedades deseadas.
Objetivo del estudio:
- Para llevar a cabo una búsqueda exhaustiva de alto rendimiento para la fase A ((8) B en todos los intermetálicos de transición binaria.
- Para identificar nuevas ocurrencias de la fase A(8) B, incluyendo formas estables y metestables.
- Para verificar los datos experimentales existentes y proporcionar nuevas predicciones para la formación de la fase A(8) B.
Principales métodos:
- Cribado computacional de alto rendimiento de compuestos intermetálicos de transición binaria.
- Utilizando un modelo de Monte Carlo basado en la expansión del clúster para el análisis termodinámico.
- Verificación de las fases predichas con respecto a las observaciones experimentales existentes.
Principales resultados:
- Se predijo un total de 59 sistemas binarios que exhiben la fase A ((8) B, un aumento sustancial de los 11 previamente conocidos.
- El estudio identificó numerosas nuevas ocurrencias, incluso en sistemas bien estudiados como el cobre-zinco (Cu-Zn).
- En el sistema Rhodium-Tungsten (Rh-W), se predijo una alta temperatura de transición orden-desorden, lo que demuestra la aplicación práctica del método.
Conclusiones:
- Los métodos computacionales de alto rendimiento son herramientas poderosas para descubrir y predecir las fases intermetálicas.
- La fase A ((8) B es más frecuente en los intermetálicos de transición binaria de lo que se pensaba anteriormente.
- Esta investigación amplía el panorama conocido de la fase A ((8) B y destaca la utilidad de la detección computacional en el descubrimiento de materiales.
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