The elastic constants of TGS are measured at room temperature. The study of the temperature dependence of shift and broadening of the Brillouin line which corresponds to a wave propagating along [0, 0, 1] gives information about the high frequency dielectric constant ε22(ω). A Debye type relaxation of the dielectric constant with a single relaxation time occurs.
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Luspin et al. (1977) studied this question.
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