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Influence of Tb substitution on low-field magnetocaloric effect in Gd5Si1.72Ge2.28 alloy

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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 (|ΔSmax| = 2.24 J/(kg·K), TC = 198 K).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Jian-qiu Deng  (邓健秋), Ri-chu Wang  (王日初), Zhen Yang  (阳 震) & Bin Xu  (徐 斌)

  2. Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Ministry of Education, Guangxi University, Nanning, 530004, China

    Ying-hong Zhuang  (庄应烘)

Authors
  1. Jian-qiu Deng  (邓健秋)
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  2. Ying-hong Zhuang  (庄应烘)
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  3. Ri-chu Wang  (王日初)
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  4. Zhen Yang  (阳 震)
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  5. Bin Xu  (徐 斌)
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Correspondence to Ri-chu Wang  (王日初).

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Foundation item: Project (50371058) supported by the National Natural Science Foundation of China

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Deng, Jq., Zhuang, Yh., Wang, Rc. et al. Influence of Tb substitution on low-field magnetocaloric effect in Gd5Si1.72Ge2.28 alloy. J. Cent. South Univ. Technol. 15, 429–433 (2008). https://doi.org/10.1007/s11771-008-0080-1

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  • DOI: https://doi.org/10.1007/s11771-008-0080-1

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