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化学学报
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化学学报 ›› 1990, Vol. 48 ›› Issue (10): 967-972. 上一篇    下一篇

研究论文

三水合稀土氯化物RECl3·3H2O的热化学研究

王建民;陈运生;郭志箴;黄树丰;王琮玉   

  1. 西北大学化学系;西北大学热化学研究室
  • 发布日期:1990-10-15

A study on thermochemistry of trihydrated rare earth chlorides

WANG JIANMIN;CHEN YUNSHENG;GUO ZHIZHEN;HUANG SHUFENG;WANG CONGYU   

  • Published:1990-10-15

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本文报道了一套化学反应绝热式热量计的设计和建立, 用(HOCH2)3CNH2与0.1mol·dm^-^3HCl的反应焓检验标定了热量计装置, 测得ΔH298.5=-245.41J·g^-^1, sdm=±0.24, 与IUPAC的推荐值-245.76±0.26J·g^-^1十分吻合, 证明热量计和操作手续是可靠的。用这样的热量计测定了十一种三水合稀土氯化物RECl3·3H2O(RE=La, Ce, Nd,Sm, Eu, Gd, Tb, Dy, er, Yb, Y)298.15K时在水中的积分溶解热(终浓度=0.01541mol·kg^-^1)。计算了这些水合物的标准生成焓和脱水焓。

关键词: 热分析, 镧化合物, 氯化物, 水合物, 生成焓, 铕化合物, 铈化合物, 热化学, 稀土化合物, 铒化合物

A new type of calorimeter was designed and was tested on the reaction enthalpy of TRIS in 0.1 mol/cm3 HCl. The DHTRIS obtained is -245.41 J/g ?0.24, which is in good agreement with the value recommended by IUPAC in 1976. Integral heats of solution of RECl3.3H2O (RE + La, Ce, Nd, sm, Eu, Gd, Tb, Dy, Erb, Yb, Y) in water at 298.15 K and final concentration = 0.01541 mol/kg anhydrous salt) were determine The standard enthalpies of formation and of dehydration (RECl3.3H2O甊ECl3) of some of these hydrates were calculated and discussed.

Key words: THERMAL ANALYSIS, LANTHANUM COMPOUNDS, CHLORIDE, HYDRATE, ENTHALPY OF FORMATION, EUROPIUM COMPOUNDS, CERIUM COMPOUNDS, THERMOCHEMISTRY, RARE EARTH COMPOUNDS, ERBIUM COMPOUNDS

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