Near-forward Raman scattering measurements on Sr 2 Nb 2 O 7 have been made for studying dispersion relation of phonon polaritons. In the low frequency region, the polariton effect has been observed for the amplitude mode located at 44 cm -1 and the mode located at 54 cm -1 at b ( c c ) b + Δ a scattering geometry. The mode at 54 cm -1 shows remarkable softening and the line-broadening toward a ferroelectric phase transition at 1342°C when temperature is increased from room temperature.
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Kojima et al. (1981) studied this question.
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