Comment on “First-principles study of high-pressure phonon dispersions of wurtzite, zinc blende, and rocksalt AlN” [J. Appl. Phys. 103, 013506 (2008)

Abstract

The linear pressure coefficients and Grüneisen parameters of AlN calculated by Saib et al. [J. Appl. Phys. 103, 013506 (2008)] are inconsistent in a systematic way, the deviations being largest for modes exhibiting large quadratic pressure coefficients. This indicates that the inconsistency could be eliminated by a careful reexamination of the calculated results. Most likely, the pressure coefficients have to be revised; significantly smaller values for the rocksalt structure should be found.