Atomic Parameters for Metallic Systems

A semi-empirical model proposed by Miedema, called cellular model [99] of alloy phases, has been proved as an effective mathematical model for the estimation of the thermodynamic properties of metallic systems, including the thermodynamic properties of intermetallic compounds and liquid alloys. According to this model, the difference of electronegativities,, denoting the charge transfer between the atoms of different elements, is the driving force for the formation of intermetallic compounds while another parameter, the difference of parameterof different elements (Table 5.15), is the 

Although the cellular model proposed by Miedema is rather successful for the semi-quantitative description of the thermodynamic property of intermetallic compounds and liquid alloys. The ignorance of geometrical factor makes this model to be somewhat inaccurate. In some of our work, inclusion of atomic radius ratio can give better results of computation by support vector regression. 

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