Calorimetric measurements of the Li[sbnd]Pd system

Abstract

This work presents the first-ever calorimetric measurements of the partial and integral mixing enthalpies of liquid LiPd alloys. These thermodynamic properties were determined with the use of an MHTC 96 drop calorimeter. The measurements for LiPd system were performed at four different temperatures (620 K, 723 K, 824 K and 926 K), up to a maximum palladium concentration equaled xPd = 0.39. The experimentally obtained values were negative in the entire studied concentration range. The values of the integral mixing enthalpies of LiPd liquid alloys are less exothermic than these predicted by the Miedema model. The highest difference between the data obtained experimentally and those calculated by the Miedema model was about 9 kJ/mol for xPd = 0.39. The experimental data of liquid LiPd solutions were elaborated with the use of the Redlich-Kister formalism and Sommer association model. A good correlation between experimental and calculated by both models results in the entire studied concentration range of Pd was observed.