A phenomenological model for the study of the lattice dynamics of hcp metals has been developed by adding an approximate electron-ion-interaction term to a five-neighbor central pair potential. Application of the model to the four hcp solids Mg, Sc, Zr, and Ho leads to dispersion curves which generally present a good agreement with the corresponding experimental curves.
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Upadhyaya et al. (1973) studied this question.
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