Debye temperature variations in alkali-halide single crystals as a function of their chemical compositions
The Debye temperature D for 18 alkali-halide single crystals is calculated using the elastic constants for temperature between 4.2 °K and 300 °K. The results are analyzed. We have characterized the various compounds in terms of the crystal lattice energy U and the ratio of cation-to-anion mass M/m. Graphs of the functions d = f(M/m) and (D) = f(U) are presented, together with a plot of the surfaces of the function d = f(T, M/m). It is found that the Debye temperature for the solid Solution KCl-KBr, in various concentrations, fits the curves of the function D = f(M/m) rather well when these curves are constructed from data for the pure single crystals.