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Light-scattering investigations in the temperature range from 10 to 850K have been performed on single crystals of silver niobate AgNbO 3 . The results are compared with structural and dielectric measurements revealing a complex sequence of phases. The Raman results and especially the strong central peak, which occurs over a wide range of frequencies and temperatures, are analysed in connection with the various phase transformations. The specific contributions of the niobium and the silver ions are tentatively discussed.
Kania et al. (Fri,) studied this question.