化学学报 ›› 1994, Vol. 52 ›› Issue (8): 735-739. 上一篇    下一篇

研究论文

HoCl~3-MCl~n体系相图的研究(M=Li, Mg, Ca, Pb; n=1, 2)

郑朝贵;黄受林;王嗣强   

  1. 北京大学化学系;北京科学技术大学
  • 出版日期:1994-08-15 发布日期:1994-08-15

Phase diagrams of binary system HoCl~3-MCl~n(M=Li, Mg, Ca, Pb; n=1, 2)

ZHENG CHAOGUI;HUANG SHOULIN;WANG SIQIANG   

  • Online:1994-08-15 Published:1994-08-15

借助于DTA与X射线衍射法研究了HoCl~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℃)、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

关键词: X射线衍射分析, 氯化铁, 差热分析, 氯化镁, 氯化钙, 相图, 氯化合物, 氯化锂

The phase diagrams of the binary systems HoCl3-MCln (M = Li, Mg, Ca, Pb; n = 1, 2) were investigated by means of DTA and x-ray diffraction anal. It was found that HoCl3-LiCl system is of peritectic type characterized by the compound Li3HoCl6 and invariant points e (50.5 mol% HoCl3, 452癈) as well as p (34.0 mol% HoCl3, 506癈). HoCl3-MgCl2, -CaCl2, and -PbCl2 systems are of simple eutectic type with eutectic points 50.0 mol% HoCl3 (580癈), 49.0 mol% HoCl3,(541癈) and 37.0 mol% HoCl3 (422癈) resp. Unstable compound, formed in the solid state, is PbHoCl5 which decomps. at 408癈. Some rules of phase diagram were explored.

Key words: X-RAY DIFFRACTION ANALYSIS, IRON CHLORIDE, DIFFERENTIAL THERMAL ANALYSIS, MAGNESIUM CHLORIDE, CALCIUM CHLORIDE, PHASE DIAGRAM, CHLORINE COMPOUNDS, LITHIUM CHLORIDE

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