Assessment of thermal expansion coefficient for pure metals

In this paper, thermal expansion coefficients of 42 pure metallic elements were evaluated on the basis of empirical and theoretical methods and the adjusted Debye-Grüneisen model. In Debye-Grüneisen model, Debye temperature was regarded as an undetermined constant. Parameters in the model were determined via the nonlinear least square fit method through MATLAB program. Besides, for pure metallic elements with phase transition, segment fitting can be realized and the computational results fit experimental data well; meanwhile, reliable forecast for high-temperature or low-temperature thermal expansion can be provided, and a set of average Debye temperatures based on thermal expansion coefficients have been obtained.