Abstract
This work set out to study the estimation method of the specific heat, C p, for the dioxides of the transuranic elements. C p was evaluated as a sum of three terms, contributions of phonon vibration, C ph, dilation, C d, and Schottky specific heat, C s, C ph and C d were calculated using the Debye temperature and Grüneisen constant obtained by high-temperature X-ray diffractometry. The method was applied to PuO 2. The estimated C p was in good accordance with the reported one measured using a calorimeter. The error in the estimation was small compared to that which arises from using the conventional method based on C p(298) and the melting temperature.
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