The elastic constants of GaSe have been determined by studying Brillouin scattering for various crystal orientations. Depending on the orientation, the spectra exhibit one or two components, which are assigned to specific modes of vibration. From the observed Brillouin frequency shifts, the elastic constants of GaSe are evaluated with a least-square-fit method. The determined values of elastic constants in units of 10 11 dyne/cm 2 are C 11 =10.5±0.4, C 12 =-2.9±0.8, C 13 =-3.32±0.12, C 33 =3.57±0.08, and C 44 =1.05±0.4 at room temperature. These values are compared with those obtained by ultrasonic and neutron-scattering methods. It has also been observed that the relative intensities of the Brillouin components are strongly dependent on crystal orientation. An analysis of this variation in intensity gives values of the ratio of the photoelastic constants: | p 12 / p 13 |≤0.05.
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Tanaka et al. (1975) studied this question.
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