Specific heat of PbMg1/3Nb2/3O3 has been measured in the temperature range 140 ÷ 790 K. The Debye function has been fitted to the data, the thermal Debye temperature determined and compared with the elastic one. Besides a specific heat anomaly at the ferroelectric phase transition another broad anomaly at about 673 K has been found. The corresponding values of ΔQ and ΔS have been estimated.
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Fousková et al. (1981) studied this question.
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