Raman spectroscopic evidence of a continuous order-disorder transition in superionic α-AgI

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Abstract
A careful determination of the temperature dependence of the integrated Raman scattering intensity and spectral shape of superionic AgI is reported from 150 to 500°C. The Raman intensity is found to vary according to the law expected for first-order scattering up to 320°C; for higher temperatures the intensity decreases by more than one order of magnitude over a temperature range of about 60°C. Currently a temperature dependence of the Raman normalized spectral shape was also observed. The data are interpreted on the basis of the possibility of an order-disorder-like transition, which takes place in the same temperature region in which specific-heat anomalies have been reported.