Calorimetric study of Zn 13 La

Abstract The thermodynamic properties of Zn 13 La were investigated by calorimetry. The standard entropy of formation at 298 K, Δ f S 298 ° ${{\Delta }_{\text{f}}}S_{298}^{{}^\circ }$ was determined from measuring the heat capacities, C p , from near absolute zero (2 K) to 300 K by the relaxation method. The standard enthalpy of formation at 298 K, Δ f H 298 ° ${{\Delta }_{\text{f}}}H_{298}^{{}^\circ }$ was determined by solution calorimetry in hydrochloric acid solution. The standard Gibbs energy of formation at 298 K, Δ f G 298 ° ${{\Delta }_{\text{f}}}G_{298}^{{}^\circ }$ was determined from these data. The coefficient, γ , of the electronic term contributing to the heat capacity of Zn 13 La was similar to the composition average of the values of pure Zn and La, indicating that the 5d- and 4f-electron states for La are localized in the vicinity of the Fermi energy level.