The (Dy1-xErx)Al2 Alloys as Active Magnetic Regenerators for Magnetic Refrigeration
The low temperature properties (heat capacity from 3 to 350 K in fields up to 10 T, and both ac magnetic susceptibility and dc magnetic susceptibility and magnetization from 4 to 325 K in dc fields up to 5.5 T) of nine (Dy1-xErx)Al2 alloys have been studied as potential active magnetic regenerator (AMR) materials for hydrogen liquefaction using magnetic refrigeration. These data indicate that the (Dy1-xErx)Al2 alloys would make excellent AMR materials, especially the combination (Dy0.4Er0.6)Al2 plus DyAl2 phase mixture, which is significantly better than the prototype (Dy0.5Er0.5)Al2 plus GdNi2 phase mixture currently being tested. In addition, the magnetic phase diagram of the (Dy1-xErx)Al2 has been determined.
KeywordsHeat Capacity Easy Axis Magnetic Phase Diagram Magnetic Refrigeration Spin Reorientation
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