Preparation of DyFe2 by the Reduction-Diffusion Process

The free energy change for the reduction-diffusion reaction which was used to prepare the DyFe2 Dy2 O3（s） + 3Ca（g） + 4Fe（s） = 3CaO（s） + 2DyFe2（s） intermetallic compound powder was calculated. The reduction-diffusion experiments were carried out at 1073, 1123. 1273 and 1373 K respectively using powders of Dy2O3, iron, and calcium grains as raw materials. XRD and EDX analysis confirmed that DyFe2 was formed by the diffusion of Dy into Fe.