Abstract
Molar enthalpies of mixing of the LiBrLaBr 3, NaBrLaBr 3, KBrLaBr 3, RbBrLaBr 3 and CsBrLaBr 3 systems have been measured with a Calvet-type high-temperature microcalorimeter. The enthalpies decrease gradually from −0.67 kJ mol −1 for the lithium system through −4.32, −10.73 and −14.97 kJ mol −1 for the sodium, potassium, and rubidium systems to −16.81 kJ mol −1 for that of cesium at the composition of the 3 MBr·LaBr 3 compound. The results have been discussed in terms of the conformal solution theory of Davis as well as in terms of relative ionic potentials.
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