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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 78  2019
Thermal Characterization of Rhombohedral Ceramics (RE6UO12) of Interest in Nuclear Industry
Rajagopal Babu, Raghavendran Venkata Krishnan,* Gude Jogeswararao, Abhiram Senapati, Krishnamurthy Ananthasivan and Kitheri Joseph
pages : 1-6 DOI : 10.1080/0371750X.2019.1567395
Abstract
Enthalpy increments of the ternary compounds of rare earth uranium oxides, RE6UO12 (RE = La, Nd, Sm, Eu, Gd) were measured by inverse drop calorimetry in the temperature range 533-1738 K. These compounds (RE6UO12) were prepared by gel combustion synthesis and characterized by XRD. From the measured enthalpy increment values, thermodynamic functions, viz. heat capacity, entropy, Gibb’s energy functions were computed. The trend in variation of heat capacity was in the order: Eu6UO12>Sm6UO12>Nd6UO12>La6UO12>Gd6UO12. This trend is explained based on (i) phonon (ii) dilatational and (iii) Schottky contributions to the heat capacity. The trend in variation of heat capacity of RE6UO12 is similar to that of RE2O3. [Keywords: Rhombohedral ceramics, Nuclear industry, Rare earth uranates, Thermal properties, Calorimetry]
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