ウランおよびトリウムリン化物の生成

抄録

Uranium phosphides were prepared by direct reaction of uranium with red phosphorus vapor. Formation of U₃P₄ began at 430°C, and the optimum temperature for the reaction was found to be 450°C. By successive decomposition of U₃P₄ in vacuum at 1, 050°C, monophase UP was obtained.
Thorium phosphides were also prepared by the same method. The composition of ThP obtained by the decomposition of Th₃P₄ was determined by chemical analysis to be ThP_0.62. By heating ThP_0.62 and some Th-ThP_0.62 mixtures to higher temperatures, monophosphides with lower contents of phosphorus were obtained. The monophase range of ThP_χ was estimated to be about ThP_0.4-0.7.
From X-ray analysis, a complete solid solution was found to be formed between UP and ThP, and the lattice parameter of the solid solutions followed Vegard's law with a slight positive deviation.