
Abstract Brillouin scattering is observed in the In x Ga 1− x P solid solution with 0.38 ⩾ × ⩾ 0. The composition dependences of the longitudinal and transverse acoustic phonons propagating along the [111] direction are investigated and compared with the expressions derived by Lakshmi et al. from the random element isodisplacement theory. Pronounced broadening of the Brillouin peaks is observed with the increasing amount of In in GaP.
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