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- Title
Heat capacity and thermal expansion coefficient of rare earth uranates RE<sub>6</sub>UO<sub>12</sub> (RE = Nd, Gd and Eu).
- Authors
Venkata Krishnan, R.; Jena, Hrudananda; Govindan Kutty, K. V.; Nagarajan, K.
- Abstract
Rare earth uranates Nd6UO12, Gd6UO12 and Eu6UO12 were prepared by combustion synthesis and characterized by XRD. Single-phase rhombohedral structure was observed for all the above compounds. Heat capacity measurements were carried out on Nd6UO12 and Gd6UO12 with differential scanning calorimetry in the temperature range 298–800 K. Enthalpy, entropy and Gibbs energy functions were computed. Heat capacity values of Nd6UO12 and Gd6UO12 at 298 K are 436 and 400 J K−1 mol−1, respectively. Thermal expansion characteristics were studied using high temperature X-ray diffraction (HTXRD) in the temperature range 298–873 K. The coefficients of thermal expansion measured for Eu6UO12 are 10.5 × 10−6 and 7.3 × 10−6 K−1 along a- and c-axis, respectively. Similarly, the coefficients of thermal expansion of Gd6UO12 along a-axis are 10.0 × 10−6 K−1 and along c-axis is 9.7 × 10−6 K−1.
- Subjects
RARE earth metals; THERMAL expansion; SELF-propagating high-temperature synthesis; X-ray diffraction; CALORIMETRY; ENTHALPY; ENTROPY
- Publication
Journal of Thermal Analysis & Calorimetry, 2010, Vol 101, Issue 1, p371
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-009-0618-y