Abstract

The activities of Dy in Dy–Fe alloys with Dy concentrations ranging from (7.0 to 89)at% were determined at (1273 to 1573)K by measuring the ion current of the vapor of Dy in equilibrium with Dy–Fe melts, Dy2Fe17+γFe, etc. The standard Gibbs energy of formation of Dy2Fe17, Dy6Fe23, DyFe3, and DyFe2 were calculated from the activities of Dy obtained from these measurements.

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