Ternary chlorides in the systems CsCl/ErCl3 and RbCl/ErCl3

Article abstract of DOI:10.1016/0040-6031(95)02811-0

The phase diagram of the system RbCl/ErCl₃ was investigated by means of DTA and the system CsCl/ErCl₃ was re-investigated. The existence of the caesium compounds Cs₃ErCl₆ (dimorphic), Cs₂ErCl₅, Cs₃Er₂Cl₇ and CsEr₂Cl₇ was confirmed. In the system RbCl/ErCl₃, there are two dimorphic, congruently melting compounds, Rb₃ErCl₆ and RbEr₂Cl₇. The incongruently melting compound Rb₂ErCl₅ (Cs₂DyCl₅ structure) is stable at temperatures higher than 348°C. The thermodynamic stabilities of the compounds were determined by solution calorimetry and e.m.f. measurements in a galvanic chlorine cell for solid electrolytes.