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The thermodynamics of mixed crystals of ammonium chloride and ammonium bromide. I. The heat capacity from 8 K to 476 K of an approximately equimolar mixture

The heat capacity of a mixed crystal of ammonium chloride and ammonium bromide, of formula NH4 Br,0.55Cl0.45, has been measured for temperatures in the range 8-300 K in one calorimeter, and 270K-476K in a second calorimeter. The mixed crystal undergoes a >.-type transition at T = 271.2K, and an essentially isothermal transition, to a facecentred cubic crystal, at 382.8 K. At this second transition, considerable superheating of the low-temperature form and supercooling of the hightemperature form can occur. Thermodynamic parameters for the mixed crystal are given at rounded temperatures.