The phonon dispersion curves in HfN have been measured at room temperature in the high-symmetry directions Δ, Σ, and Λ by coherent inelastic neutron scattering. Anomalies in the dispersion of the acoustic branches have been detected which are similar to those that have already been reported for superconducting transition-metal compounds with nine valence electrons. The experimental results are well described by a double-shell model which is also used to calculate the density of states.
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Christensen et al. (1983) studied this question.