Anharmonic Contributions to the Vibratory Free Energy of a Lattice
- 1 January 1964
- journal article
- research article
- Published by CSIRO Publishing in Australian Journal of Physics
- Vol. 17 (3) , 269-281
- https://doi.org/10.1071/ph640269
Abstract
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 valueKeywords
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