This paper reports on measurements of the specific heat of Pb 2 CdWO 6 made at temperatures ranging from 80 to 750 K and of Pb 2 YbTaO 6 within the 350-to 700-K temperature range. First-order phase transitions from the cubic phase at 677.3 and 581 K, respectively, were observed, and their thermodynamic characteristics were determined. The entropy change on the phase transitions is close to R ln4 for both compounds. The results obtained are discussed in terms of the model of position disordering of the lead ions. It was established that below 350 K, Pb 2 CdWO 6 can exist in two states, stable and metastable, depending on the sample thermal prehistory.
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Горев et al. (2002) studied this question.
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