Standard Gibbs Energy of Formation of Mg 3 La Determined by Solution Calorimetry and Heat Capacity Measurement from Near Absolute Zero Kelvin

The standard Gibbs energy of formation, Á f G o T , of Mg 3 La in the temperature range from near absolute zero Kelvin to 525 K were determined by calorimetry. The heat capacities, C p , from 2 K to 525 K were measured by the relaxation method and DSC. The Á f G o T (Mg 3 La) values were determined by combining the C p data with the standard enthalpy of formation at 298 K which was measured by the Calvet-type calorimeter using hydrochloric acid solution. From 2 to 350 K, the Á f G o T increases gradually, and it can be evaluated as a linear function of temperature above 350 K as follows: This result is expected to be useful as basic thermodynamic data of Mg-based alloys