Synthesis of neodymium and samarium monoxides under high pressure
Synthesis of neodymium and samarium monoxides under high pressure
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DOI：
10.1002/chin.198044028
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发表时间：
1980-08
期刊：
影响因子：
--
通讯作者：
J. Leger;N. Yacoubi;J. Loriers
中科院分区：
文献类型：
--
作者：
J. Leger;N. Yacoubi;J. Loriers
在高压下，钕和钐的三氧化物与纯金属发生反应，而在常压下情况并非如此。在常压下回收的新化合物可能处于亚稳态，具有面心立方结构，其晶胞参数分别为 4.994 和 4.943 Á。化学分析未显示氢、碳或氮的严重污染。钕化合物的晶格常数等于假设金属处于三价态时针对一氧化物计算的值；对于钐来说，它稍大一些。钐的价态似乎略低于 3。尽管研究了大范围的压力和温度（10-80 kbar，500-1200 C），但没有观察到铥发生反应。
Under high pressure the neodymium and samarium sesquioxides react with the pure metals, which is not the case at ordinary pressure. The new compounds, recovered at normal pressure probably in a metastable state, have a face centered cubic structure and their cell parameters are respectively 4.994 and 4.943 Á. Chemical analyses do not show major contamination by hydrogen, carbon, or nitrogen. The lattice constant of the neodymium compound is equal to the valuecalculated for the monoxide on the assumption that the metal is in the trivalent state; for samarium it is slightly larger. Samarium appears to be in a valence state slightly lower than 3. No reaction is observed for thulium although a large range of pressures and temperatures were investigated (10-80 kbar, 500-1200 C).