Drop calorimetric determination of enthalpy content of the systems AgI + 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.