The studies of phase relation, microstructure, magnetic transition, magnetocaloric effect in (Gd1−xErx)5Si1.7Ge2.3 compounds |
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Authors: | Xiang Chen Yungui Chen Yongbai Tang |
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Affiliation: | a School of Materials Science and Engineering, Sichuan University, Chengdu 610065, PR China b Department of Physics and Electronic Informational Engineering, Neijiang Teachers College, Neijiang 641002, PR China |
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Abstract: | The phase relation, microstructure, Curie temperatures (TC), magnetic transition, and magnetocaloric effect of (Gd1−xErx)5Si1.7Ge2.3 (x = 0, 0.05, 0.1, 0.15, and 0.2) compounds prepared by arc-melting and then annealing at 1523 K (3 h) using purity Gd (99.9 wt.%) are investigated. The results of XRD patterns and SEM show that the main phases in those samples are mono-clinic Gd5Si2Ge2 type structure. With increase of Er content from x = 0 to 0.2, the values of magnetic transition temperatures (TC) decrease linearly from 228.7 K to 135.3 K. But the (Gd1−xErx)5Si1.7Ge2.3 compounds display large magnetic entropy near their transition temperatures in a magnetic field of 0-2 T. The maximum magnetic entropy change in (Gd1−xErx)5Si1.7Ge2.3 compounds are 24.56, 14.56, 16.84, 14.20, and 13.22 J/kg K−1 with x = 0, 0.05, 0.1, 0.15, and 0.2, respectively. |
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Keywords: | (Gd1&minus xErx)5Si1 7Ge2 3 compounds Curie temperatures Magnetic transition Magnetocaloric effect |
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