Influence of Tb substitution on low-field magnetocaloric effect in Gd5Si1.72Ge2.28 alloy |
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| Authors: | Jian-qiu Deng Ying-hong Zhuang Ri-chu Wang Zhen Yang and Bin Xu |
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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−x
Tb
x
)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 (T
C) of the compounds. The magnetic entropy change of (Gd1−x
Tb
x
)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 (|ΔS
max| = 2.24 J/(kg·K), T
C = 198 K).
Foundation item: Project (50371058) supported by the National Natural Science Foundation of China |
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| Keywords: | rare earth alloy magnetic entropy change magnetic phase transition magnetocaloric effect (MCE) |
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