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借助于DTA与X射线衍射法研究了HoC_3-MCl_n(M=Li,Mg,Ca,Pb;n=1或2)二元体系相图.发现HoCl_3-LiCl体系相图属固液异组成型,有一化合物Li_3HoCl_6生成,且在483℃有一相转变.其无变点分别为p(34.0mol%HoCl_3,506℃)和e(50.5mol％HoCl_3,452℃); 而HoCl_3-MgCl_2,CaCl_2,PbCl_2。体系皆属简单低共熔型相图.其低共熔点e的组成与温度分别为:50.0mol％HoCl_3(580℃)、49.0mol％HoCl_3(541℃)和37.0mol％HoCl_3(422℃).HoCl_3-PbCl_2体系在固相下有一不稳定化合物PbHoCl_5生成,在408℃分解.同时探讨了RECl_3-LiCl相图的某些规律。
The phase diagram of HoC_3-MCl_n (M = Li, Mg, Ca, Pb; n = 1 or 2) binary system was studied by means of DTA and X-ray diffraction.The phase diagram of HoCl_3- There is a compound Li 3 HeCu 6 which has a phase transition at 483 ° C. The unchanged points are p (34.0 mol% HoCl 3, 506 ° C.) and e (50.5 mol% HoCl 3, 452 ° C.), while HoCl 3 -MgCl 2, CaCl 2, PbCl 2. The system is a simple eutectic phase diagram, the composition and temperature of eutectic point e are 50.0mol% HoCl_3 (580 ℃), 49.0mol% HoCl_3 (541 ℃) and 37.0mol% HoCl_3 (422 ℃) respectively. The HoCl_3-PbCl_2 system was formed by the unstable PbHoCl_5 solid phase and decomposed at 408 ℃. Some regularities of the phase diagram of RECl_3-LiCl were also discussed.