Metal fuel is a promising candidate for the pyro-processed nuclear fuel, but the problem of loss of nuclear material due to the high reactivity of metal fuel and melting crucible in the metal fuel casting process must be solved for loss control and waste reduction. In this study, fabrication test was conducted to develop a new material NdYO₃ as a new crucible material to improve the degree of anti-reactivity. The NdYO₃ compact was manufactured by the CIP (Cold isostatic pressing) method with changing fraction of Nd₂O₃ and Y₂O₃ powders. Sintering process was performed at 1550°C for 10 hours. The systematic trends of XRD patterns shows that phase transformations form cubic structure to monoclinic structures occurred with the addition of Y₂O₃. The rate of pore were discussed with change of fraction of Nd₂O₃ and Y₂O₃.

LaYO₃ which has phase stability at high temperature is introduced as a promising candidate for reaction-preventing crucible materials with Uranium-Zirconium (U-Zr) melt containing rare-earth elements (RE). RE is composed of rare-earth elements such as Nd, Ce, Pr and La. The LaYO₃ material was synthesized by a solid-state reaction method at elevated temperature according to a pseudo-phase diagram of LaYO₃ and Y₂O₃. Green compacts blended with La₂O₃ and Y₂O₃ powder were made by the Cold Isostatic Pressing (CIP) method, with La₂O₃ and Y_{2O3 powders varying with molar ratios from 1.0 to 1:2. LaYO3 synthetics were fabricated at sintering temperatures ranging from 1450°C to 1600°C. LaYO3 pellets sintered at below 1550°C showed a highly dense orthorhombic phase with a perovskite structure, resulting in an enhancing reaction-resistant effect with RE.}