Abstract
An adiabatic bond charge model has been applied to calculate the phonon dispersion and the density of states of the nitride materials InN, GaN, AlN and BN in the zinc-blende and wurtzite (WZ) phases. The results for the two phases are compared, the angular dependence of the zone-centre mode in the WZ phase is examined, and a discussion is provided on the anti-crossing behaviour of the A 1 acoustic and E 2 optical phonon modes in the WZ phase.
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