本文基于纯金属中的原子 /空位双组元模型 ,由空位的偏摩尔自由能定义给出了金属晶体中空位化学位的表达式。对于含有空位摩尔浓度为 Cν,其热力学平衡态空位摩尔浓度为 C0 的纯金属晶体 ,在环境温度为 T时 ,其空位化学位的表达式则为 :μν(Cν) =RT+ RTln(Cν/ C0 ) ;热力学平衡态时为 :μν(C0 ) =RT。上式中的第二项为由 J.P.Hirth[1 ] 所给出的“相对于标准 (热力学平衡 )态的空位化学位”,而第一项则为本文所给出的“标准 (热力学平衡 )态的空位化学位 In this paper, based on the atomic / vacancy bicomponent model in pure metals, the expression of vacancy chemical degrees in metal crystals is given by the definition of the partial molar free energy of vacancies. For a pure metal crystal containing a vacancy molar concentration Cv and a thermodynamic equilibrium vacancy molar concentration C0, the expression for the vacancy chemical potential at ambient temperature T is: μν (Cν) = RT + RTln (Cν / C0 ); Thermodynamic equilibrium state: μν (C0) = RT. The second term in the above equation is the “vacancy chemical position relative to the standard (thermodynamic equilibrium) state” given by JP Hirth [1], while the first term is the "standard (thermodynamic equilibrium) State vacancy chemical position