Temperature dependence of the linewidth of the first-order Raman spectrum for GeO2 powder
The first-order Raman spectrum of A1g mode in GeO2 powder was measured at a temperature range of 130–973 K and the linewidths at these temperatures were obtained. The temperature dependence of the linewidths was analysed by the phonon dispersion curves based on the rigid ion model, and the results show that it was caused perhaps by the cubic anharmonic term in crystal potential energy.
Volume 94, 2020
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