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关于镧、镨、钕、钐水合氯化物脱水过程中各阶段的热效应△H值,文献中的报道不很一致。及等人根据水蒸气压力与脱水温度之间的关系,用Clausius-clapeyron方程式求出的△H值与Ashcroft等人用DSC法直接测定的热效应,特别是一水合物脱水的热效应相差很大。为此,我们同时用上述两种方法进行了研究。本文仅讨论用DSC法测定镧、镨、钕、钐水合氯化物脱水过程中各阶段的热效应。
On the lanthanum, praseodymium, neodymium, samarium chloride dehydration process of various stages of the thermal effect △ H values reported in the literature is not very consistent. And others based on the relationship between water vapor pressure and dehydration temperature, the ΔH value calculated by Clausius-clapeyron equation and Ashcroft et al. Direct determination by DSC heat effect, especially the thermal effect of dehydration of monohydrate difference is very large. For this reason, we conducted the research in the above two ways at the same time. This article discusses only the DSC method for the determination of lanthanum, praseodymium, neodymium, samarium chloride dehydration process of the various stages of the thermal effect.