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Structure, magnetic properties and magnetocaloric effects of Fe50Mn15−x Co x Ni35 alloys

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Abstract

Fe50Mn15−x Co x Ni35 (x=0, 1, 3, 5, 7) alloys were prepared by arc melting under purified argon atmosphere. The ingots were homogenized at 930°C for 90 h followed by water quenching. The crystal structure, magnetic properties and magnetocaloric effects of the alloys were studied by X-ray diffraction (XRD) and MPMS-7-type SQUID. The results show that all samples still maintained a single γ-(Fe, Ni)-type phase structure. With the increase of the content of Co, the Curie temperatures of these alloys increased and exhibited a second-order magnetic transition from ferromagnetic (FM) to paramagnetic (PM) state near Curie temperature. The maximum magnetic entropy change and the relative cooling power of Fe50Mn10Co5Ni35 alloy was 2.55 J/kg·K and 181 J/kg, respectively, for an external field change of 5 T. Compared with rare earth metal Gd, Fe50Mn15−x Co x Ni35 series of alloys have obvious advantage in resource price; their Curie temperatures can be tuned to near room temperature, maintain a relatively large magnetic entropy change at the same time and they are a type of potential magnetic refrigeration materials near room temperature.

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Authors and Affiliations

  1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China

    XiChun Zhong, HuaCun Tian, PengFei Tang, ZhongWu Liu, ZhiGang Zheng & DeChang Zeng

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  1. XiChun Zhong
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  2. HuaCun Tian
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Correspondence to XiChun Zhong.

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Zhong, X., Tian, H., Tang, P. et al. Structure, magnetic properties and magnetocaloric effects of Fe50Mn15−x Co x Ni35 alloys. Sci. China Phys. Mech. Astron. 57, 437–441 (2014). https://doi.org/10.1007/s11433-013-5383-z

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