Lattice heat capacity and thermal vibrations in alkali metals

The lattice heat capacity cv(T) and mean‐square displacement of the ion, \documentclass{article}\pagestyle{empty}\begin{document}$ \overline {x^2 } $\end{document}(T) in alkali metals are calculated on the basis of the pseudopotential model described earlier. Agreement with experiment is in general quite good for Debye temperatures θ and not bad for the dependences cv(T). Some conclusions on the phonon spectrum of Cs are drawn from the data on heat capacity. The pseudopotentials giving a good description of the phonon spectra of Na, K, Rb are proposed. Values of \documentclass{article}\pagestyle{empty}\begin{document}$ \overline {x^2 } $\end{document}(T) are discussed in detail and compared with experiment. The sensitivity of all the results to the approximations for the dielectric function ε(q) and for the pseudopotential V(q) and for the pseudopotential V(q) is also discussed. [Russian Text Ignored].