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对CsBr－NdBr3－13％HBr－H2O四元体系25℃时的相平衡进行了研究，比较CsBr与REBr3（RE=La，Pr，Nd，Sm）在氢溴酸介质中反应的相化学关系发现，轻稀土的相似性和以Nd为界的“二分组效应”首次在相化学行为上有所体现．对化合物5CsBr·2REBr3·22H2O做了热分析测试．根据体系的相化学关系设计了新的固相反应，并进行了新类型化合物的合成．
The phase equilibrium of CsBr-NdBr3-13% HBr-H2O quaternary system at 25 ℃ was studied. The phase chemical relationship between CsBr and REBr3 (RE = La, Pr, Nd, Sm) , The similarity of light rare earths and Nd-bounded “two grouping effect ” for the first time reflected in the phase of chemical behavior. The thermal analysis of 5 CsBr · 2REBr3 · 22H2O was done. According to the phase chemistry of the system, a new solid-phase reaction was designed and a new type of compound was synthesized.