Thermodynamics of the formation of magnesium–zinc intermetallic compounds in the temperature range from absolute zero to high temperature Original Research Article

The standard Gibbs energies of formation image of Mg–Zn binary compounds in the temperature range from near absolute zero to high temperature were determined by calorimetry for the first time. Their heat capacities (Cp) from near absolute zero (2 K) to high temperature were measured by the relaxation method and differential scanning calorimetry. Their image values were determined by combining the Cp data with the standard enthalpies of formation at 298 K image which were previously determined by solution calorimetry in hydrochloric acid solution. From near absolute zero to 300 K, the image values increase monotonically, and then above 300 K they can be evaluated as a linear function of temperature as follows (in kJ mol−1): image. The results obtained are expected to be useful as basic thermodynamic data for Mg-based alloys.