Phase change materials in the ternary system NH4Cl+CaCl2+H2O

► We measure solubility isotherms of the system NH4Cl-CaCl2-H2O at 273.15 and 298.15 K. ► We simulated phase diagram of this system from 273 to 323 K by a thermodynamic model. ► A pseudo 'eutectic' phase change material is found at about 299 K.