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首页> 外文期刊>Journal of thermal analysis and calorimetry >Ternary chlorides of the trivalent late lanthanides - Phase diagrams, crystal structures and thermodynamic properties
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Ternary chlorides of the trivalent late lanthanides - Phase diagrams, crystal structures and thermodynamic properties

机译：Ternary chlorides of the trivalent late lanthanides - Phase diagrams, crystal structures and thermodynamic properties

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摘要

A comprehensive review on phase diagrams, crystal structures and thermodynamic properties of ternary chlorides formed in the systems ACl/LnCl(3) (A=Na, K, Rb, Cs) is presented. It continues an earlier review with the same contents on the lanthanides from La to Gd [1]. In both papers the author's own studies, published since 1985, together with original papers from other scientists are treated. With the three larger cations compounds of the composition A(3)LnCl(6), A(2)LnCl(5), ALn(2)Cl(7) and beginning with holmium Cs(3)Ln(2)Cl(9) are formed. With sodium the compounds Na(3)Ln(5)Cl(18) (Ln=La to Sm) and NaLnCl(4) (Ln=Eu to Lu) also exist. The stability of a ternary chloride in a system ACl/LnCl(3) is given by the 'free enthalpy of synreaction', the formation of a compound from its neighbour compounds in its system. This Delta G(syn)(0) must be negative. A surprising result is that the highest - melting compounds in the systems, A(3)LnCl(6), are formed from ACl and A(2)LnCl(5) with a loss of lattice energy, U. They exist as high-temperature compounds due to a sufficiently high gain in entropy at temperatures where the entropy term T Delta S compensates the endothermic Delta H.

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