Abstract
The variation in thermophysical properties along the lanthanide series for RE6UO12(s) was investigated. Structural characterization of Er6UO12(s) was carried out by Rietveld refinement method. The trend in heat capacity along the rare earth series for RE6UO12(s) and RE2O3(s) as function of ionic radius of RE3+ was found to be similar. Hence, the sole cause of excess heat capacity in rare earth uranates was concluded to be the rare earth ion. Linear relation was found between the thermal expansion coefficient of RE6UO12(s) (RE = La, Gd, Lu) and the ionic radii of rare earth ion.
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