Abstract
The Invar alloy La(Fe xAl x−1) 13 with NaZn 13-type cubic structure was prepared. Using single crystals of CaF 2 as solid electrolyte, the activity and the relative partial molar Gibbs free energy of lanthanum in La(Fe xAl 1−x) 13 alloys were determined by the e.m.f. method over the temperature range 983–1085 K. The melting point and the phase transition temperature of two La(Fe xAl 1−x) 13 alloys were measured by differential thermal analysis. The average molar heat capacity was measured using a high temperature microcalorimeter in the temperature range 416–610 K.
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