Ternary chlorides in the systems Acl/TmCl3 (A = Cs, Rb, K)

Article abstract of DOI:10.1006/jssc.1997.7610

The phase diagrams of the systems ACl/TmCl₃ (A= Cs, Rb, K) were investigated by DTA and XRD. Compounds A₃TmCl₆, A₂TmCl₅, ATm₂Cl₇, and Cs₃Tm₂Cl₉ exist. Rb₂TmCl₅ is the first 2:1 compound in the series La to Lu crystallizing in the Cs₂DyCl₅ structure with connected [TmCl₆] octahedra. By emf vs T measurements in galvanic chlorine cells for solid electrolytes for all compounds, ATm₂Cl₇ excepted, the thermodynamic functions for the formation from the compounds adjacent in the phase diagrams could be determined.