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Structural, Magnetic and Magnetocaloric Effect of Gd6(Mn1−xFex)23 Compounds

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Abstract

The influences of Mn/Fe ratio on the structural, magnetic and magnetocaloric properties of Gd6(Mn1−xFex)23 (x = 0.0–0.5) compounds have been investigated by means of X-ray diffraction (XRD) and magnetic measurements. The XRD results show the compounds crystallize in the cubic Th6Mn23-type structure, and the lattice size decreases with the decrease in Mn/Fe ratio. Magnetic measurements show that the samples exhibit a second-order magnetic transition from TC = 99 K for x = 0.3 down to TC = 89 K for x = 0.4 and increase to 293 K for x = 0.5. The magnetization measured at 10 K decreases from 119 emu/g for x = 0.0 to 82 emu/g for x = 0.4, but the magnetization is 105 emu/g at x = 0.5. For an applied field from 0 to 5 T, the maximum values of magnetic entropy change (− ΔSM) for Gd6(Mn1−xFex)23 compounds with x = 0.3, 0.4 and 0.5 are 3.56 J/kg K, 3.77 J/kg K and 1.79 J/kg K, respectively. The properties of Gd6(Mn1−xFex)23 compounds help to understand the exceptional physical characteristics and provide the information for seeking giant magnetocaloric materials.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (51461012, 51761007), the Guangxi Key Laboratory of Information Materials (171017-Z, 171022-Z), the Guangxi Natural Science Foundation (2016GXNSFAA380030, 2016GXNSFGA380001), GUET Excellent Graduate Thesis Program (16YJPYSS32) and Innovation Project of GUET Graduate Education (2018YJCX84).

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Authors and Affiliations

  1. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, China

    P. L. Dong, L. Ma, X. Zhou, D. Wang, Q. R. Yao & L. Li

  2. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin, 541004, China

    L. Ma, Q. R. Yao & L. Li

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  1. P. L. Dong
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Correspondence to L. Ma.

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Dong, P.L., Ma, L., Zhou, X. et al. Structural, Magnetic and Magnetocaloric Effect of Gd6(Mn1−xFex)23 Compounds. J Low Temp Phys 195, 221–229 (2019). https://doi.org/10.1007/s10909-019-02155-0

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