Influence of Tb substitution on low-field magnetocaloric effect in Gd5Si1.72Ge2.28 alloy |
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| Authors: | DENG Jian-qiu ZHUANG Ying-hong WANG Ri-chu YANG Zhen XU Bin |
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| Affiliation: | [1]School of Materials Science and Engineering, Central South University, Changsha 410083, China; [2]Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Ministry of Education, Guangxi University, Nanning 530004, China |
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| Abstract: | The lattice parameters, magnetic phase transition, Curie temperature and magnetocaloric properties for (Gd1-xTbx)5Si1.72-Ge2.28 alloys with x = 0, 0.15, 0.20 and 0.25 were investigated by X-ray powder diffractometry and magnetization measurements. The results show that suitable partial substitution of Tb in Gd5Si1.72Ge2.28 compound remains the first-order magnetic-crystallographic transition and enhances the magnetic entropy change, although Tb substitution decreases the Curie temperature (Tc) of the compounds. The magnetic entropy change of (Gd1-xTbx)5Si1.72Ge2.28 alloys retains a large value in the low magnetic field of 1.0 T.The maximum magnetic entropy change for (Gd0.80Tb0.20)5Si1.72Ge2.28 alloy in the magnetic field from 0 to 1.0 T reaches 8.7 J/(kg·K),which is nearly 4 times as large as that of (Gd0.3Dy0.7)5Si4 compound (|△Smax| = 2.24 J/(kg·K), TC = 198 K). |
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| Keywords: | rare earth alloy magnetic entropy change magnetic phase transition magnetocaloric effect (MCE) |
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