Thermodynamic Study of Cu-Nd Alloys by Mass Spectrometry

Abstract

The activities and partial molar heats of mixing were determined in a liquid Cu-Nd system at 1,600 K using a Knudsen cell and a quadrupole mass spectrometer. The ion intensity ratio for the alloy components was measured for the system and the thermodynamic values were calculated using a modified Gibbs-Duhem equation. The liquid Cu-Nd system shows strong negative deviations from ideal behavior. The partial and integral molar heats of mixing are compared with values in the literature.