
%0 Journal Article
%A Lloyd, P 
%T Anharmonic Contributions to the Vibratory Free Energy of a Lattice
%J Australian Journal of Physics
%D 1964/09/01
%V 17
%N 3
%P 269-281
%K 
%R https://doi.org/10.1071/PH640269
%U https://www.publish.csiro.au/paper/PH640269 
%X The anharmonic contribution to the free energy of a lattice is evaluated by means of a Bethe approximation. The approximation is accurate to within 3% for the model valuated by Maradudin, Flinn, and Coldwell· Horsfall. The anharmonic contribution to the specific heat at constant volume of a model of sodium is evaluated.The specific heat is found to increase as the temperature rises but the rate of increase is lower than the observed value 
