Abstract
AbstractSecond derivatives of the lattice potential energy, derived on the basis of a Born model of cohesion that has been modified to account for ionic asphericity, have been examined by calculating zero wavenumber azide librational mode frequencies and two elastic moduli for the tetragonal alkali azides. Comparison of the results with experimental data favors a dispherical representation of the closed‐shell repulsive character of azide ions over ellipsoidal representations.
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