Shape effect on the size and dimension dependent order–disorder transition temperatures of bimetallic alloys

Abstract

Chemically ordered bimetallic nanocrystals may be promising candidates for the future magnetic-storage applications. In order to theoretically understand the order–disorder transition in nanoscale, a model based on the previous result for the size and dimension dependent melting temperature is developed to describe the effects of sizes, shapes and dimensions on order–disorder transition temperatures ( T OD) of bimetallic alloys. The results show that T OD drops as size decreases, shape factor increases and dimension decreases. Also, the shape effect on T OD cannot be neglected. Among these effects on T OD, size is the strongest, while shape is the weakest. All these conclusions have been compared and confirmed by the recent simulations and experiments.