Debye?Waller Factors of a-Iron and Sodium. II. Willis's Anharmonic Theory

Abstract

An application of Willis's anharmonic theory has been made to improve the earlier calculations of the Debye-Waller factors of (X-iron and sodium reported in Part I, and to estimate the effect of including anharmonic. terms in the crystal potential. The calculations have been compared with the existing experimental data in terms of the Debye-Waller factor temperature parameter Y. The agreement between the calculated values and the experimental results is now shown to be quite good over a wide range of temperature.