The first-order Raman spectra of internal A1 and external modes in sintered hexagonal GeO 2 crystalline were measured in the temperature range of 293–873 K and the linewidths at these temperatures were obtained. The temperature dependence of the linewidths was analyzed using the phonon dispersion curves calculated on the basis of a rigid-ion model, and the results showed that it was caused approximately by the cubic anharmonic term in the crystal potential energy.
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Satō et al. (1998) studied this question.
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