Abstract
The original model of de Launay has been extended to consider interionic interactions out to fourth neighbours. The present formalism has been applied to study lattice dynamics of four alkali metals viz sodium, potassium, lithium and rubidium. The phonon dispersion curves along the principal symmetry directions, frequency versus frequency distribution function as well as lattice heat capacities are calculated and compared to experimental results. An excellent agreement has been obtained between the theoretical and experimental results for all the four metals studied here.
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Cavalheiro, R., Shukla, M.M. Extended de Launay model study of lattice dynamics of alkali metals. Acta Physica 37, 187–205 (1974). https://doi.org/10.1007/BF03158197
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DOI: https://doi.org/10.1007/BF03158197