Vibrational Spectroscopy of Aluminum Nitride


  • R. A. Condrate—contributing editor

  • Work at Argonne National Laboratory supported by the U.S. Department of Energy, BES–Materials Sciences, under Contract No. W-31–109-ENG-38.


A complete description of the first-order Raman and Brillouin spectra of single-crystal aluminum nitride is provided. The frequency has been measured and the symmetry identified of each of the Raman-active zone-center optic modes, and the five independent elastic constants have been measured. The widths of the principal Raman modes increase with increasing oxygen content up to a critical value of approximately 1 at.%, after which they are constant. This behavior supports the hypothesis of a change in the nature of the oxygen defect at that concentration.