Abstract
The solubility limits of Ce, Nd and U in CaTi0 3, one of the promising host matrix for fixation of lanthanide and actinide elements, were determined by X-ray diffraction to be between 20 and 30 mol%, between 20 and 30 mol% and between 0 and 3 mol%, respectively. By substituting Al to Ti in CaTiO 3, the solubility limit of U in CaTiO 3 increased to be between 5 and 7.5 mol%. The thermogravimetric analyses of (Ca 0.80Ce 0.20)TiO 3±y was carried out at 1273 K and 1373 K in the oxygen partial pressure range of 10 −14 - 10 −6 Pa. In the higher oxygen partial pressure region, the sample of single CaTiO 3 phase decomposed into three phases consisting of perovskite phase, CeO 2 and TiO 2.
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