The specific heat of Na0.5Bi0.5TiO3 crystal in the temperature range 300–650 K and the changes of spontaneous polarization of Na0.5Bi0.5TiO3 ceramic in the temperature range 4.2–90 K were measured. The calorimetric measurements showed that the anomaly of specific heat exists in the temperature range where the phase transition rate from the rhomhedral phase to the tetragonal phase is utmost. From low-temperature pyroelectric effect a phonon wave number equal to 128 cm−1 was found to have the main share in the temperature changes of spontaneous polarization.
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Suchanicz et al. (1997) studied this question.
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