Abstract
We carefully studied the magnetic properties and magnetocaloric effect of GdxEr1-xGa (0 ≤ x ≤ 1) compounds. The GdxEr1-xGa compounds undergo two magnetic transitions with temperature increasing: spin-reorientation or antiferromagnetic-to-ferromagnetic (FM) transition and FM-to-paramagnetic transition. As the content of Gd increases from 0 to 1, the transition temperature in low temperature region changes from 15 K to 66 K and the Curie temperature increases obviously from 30 K to 181.9 K. Although the maximum value of magnetic entropy change (ΔSM) for GdxEr1−xGa decreases with the increase of x, the refrigerant capacity (RC) improves remarkably compared with that of ErGa compound. Table-like ΔSM curves are observed for the compounds with x = 0.1, 0.2, 0.3, and 0.4, which are very useful for real cooling applications. And Gd0.2Er0.8Ga and Gd0.3Er0.7Ga compounds show better magnetocaloric features than others in this series under considerations of both ΔSM and RC. The results of this series of compounds show us a possible way to design and improve the magnetic refrigerant materials by making some substitutions.
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