Single crystals of aluminum nitride were studied by Raman scattering under hydrostatic pressure up to 13 GPa. Four of the six allowed modes were observed and identified. Our results under ambient conditions do not agree with already published data. The A₁(TO), E₂⁽²⁾, and E₁(LO) have been followed as a function of pressure and have mode-Gr\"uneisen coefficients of 1.58, 1.26, and 0.38, respectively. These data are compared with recent data obtained on single crystals of gallium nitride.
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Perlin et al. (1993) studied this question.
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