Abstract
The effect of Dy addition on the structure, magnetic and magnetocaloric properties of polycrystalline PrCo2 compound were investigated by x-ray diffraction (XRD) and magnetic measurements. The powder XRD patterns show that all the Pr1-xDyxCo2 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) samples are linear solid solutions with C15 cubic Laves phase and MgCu2-type structure. With the increases of Dy content, the lattice parameter decreases from 7.3090 Å for PrCo2 to 7.1914 Å for DyCo2, and the Curie temperature increases from 42 K (x = 0.0) to 151 K (x = 1.0). From the Arrott plots, the sample show the first order transition when 0.4 ≤ x ≤ 1.0. The magnetic entropy change of second-order PrCo2 compound is 10.7 J kg−1·K−1. And the magnetic entropy change of Pr0.6Dy0.4Co2 is the minimum of the whole system. After x ≥ 0.4, the magnetic entropy change value gradually increases, up to 10.4 J kg−1·K−1 for first-order DyCo2 compound. The RCP of these compounds was discussed.
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