Abstract
Phonon dispersion relations in zinc single crystals were measured in the symmetry directions [0001], [0110] using the triple axis crystal spectrometer and the cold neutron time-of-flight methods. Theoretical expressions for these relations were calculated using the Born–von Kármán theory with third and fourth neighbour force interactions of central and general type. Comparison of the theoretical and experimental curves for the direction [0001] shows a good fit in shape and initial slopes. For the direction [0110] the longitudinal branches fit the shapes of the calculated curves. The optical and acoustical branches in the [0110] direction with the polarization normal to the basal plane do not fit the theoretical curves either in shape or in magnitude. A possible explanation of this discrepancy is given.
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