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Results are presented for the Raman spectra, the far-infrared reflectivity spectra, and the radio-frequency dielectric constant of several selected PLZT ceramics. Vibrational modes are assigned by comparing these results with previous Raman and infrared measurements on single-crystal PbTiO3, and the PZT and PLT mixed ceramic systems. The mode responsible for the temperature variation of the low-frequency dielectric constant was not observed but is shown to be below 65 cm−1.
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Lurio et al. (1974) studied this question.
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