Experimental results of the Li-Pb-Pt system obtained by the high temperature drop calorimetry

Abstract The integral enthalpy of mixing of the ternary Li-Pb-Pt system was measured using high temperature drop calorimetry. Four independent series of fixed mole ratios of Li to Pb equaled to 1/3, 1, 3, and Pb to Pt equaled to 4 were conducted at 1026 K. The measurements were divided into three continuous parts. Firstly, the calorimeter was calibrated by dropping the pieces of Pb, subsequently, pieces of the second component (Li or Pt) were added to form a binary alloy, and then the study of the integral enthalpy of mixing of ternary Li-Pb-Pt began. The thermodynamic results are characterized by negative deviations to the ideal solution in the entire measured concentration range. Based on the experimental data for the Li-Pb-Pt solutions and on the integral enthalpy of mixing of the binary Li-Pb, Li-Pt and Pb-Pt solutions the ternary interaction parameters were determined and presented.