Drop Calorimetric Determination of Enthalpy Content of the Systems Agl + MI (M = K, Rb, Cs, NH4, (CH3)4N)

Abstract

The enthalpy contents of the systems of composition AgI + MI (0.8 mole fraction AgI) are reported as a function of temperature. For M = K, Rb and NH4 the heats of incongruent melting of the compounds Ag4MI5 are quoted. For M = Cs the depression of the temperature of the β⇌α transition of AgI is confirmed. For M =(CH3)4N the measurements indicate no such transformation. This is probably due to the formation of Ag2MI3 and Ag13M2I15.