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Influence of gadolinium and dysprosium substitution on magnetic properties and magnetocaloric effect of Fe78-xRExSi4Nb5B12Cu1 amorphous alloys

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Journal of Rare Earths 2020年第12期38卷 1317-1321页

作者： Lizhong Zhao huacun tian Xichun Zhong Zhongwu Liu Jean-Marc Greneche R.V.Ramanujan Institute of Advanced Magnetic Materials Hangzhou Dianzi UniversityHangzhou 310012China School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China Guangdong Institute of Special Equipment Inspection and Research Guangzhou 528251China Institut des Molecules et Materiaux du Mans UMR CNRS 6283 Le Mans UniversiteAvenue MessiaenLe MansF-72085France School of Materials Science and Engineering Nanyang Technological University639798Singapore Singapore-HUJ Alliance for Research and Enterprise(SHARE) Nanomaterials for Energy and Energy-Water Nexus(NEW)Campus for Research Excellence and Technological Enterprise(CREATE)Singapore138602Singapore

Amorphous Fe78-xRExSi4 Nb5 B12Cu1(RE=Gd,Dy) ribbons with different RE contents were prepared by melt spinning to investigate the effect of heavy rare earth(Gd,Dy) substitution on the hyperfine structure,magnetic properties and magnetocaloric *** Curie temperature of RE substituted alloys,hyperfine field and magnetic moments of Fe atoms initially increase up to 1 at% RE content and then decrease monotonously for increasing RE content up to 10 at%.The dependence of magnetic entropy change(-△SM) and refrigeration capacity(RC) of the alloys on RE contents displays the same *** RCAREA values of the alloys substituted with 1 at% Gd and Dy are similar to those of recently reported Fe-based metallic glasses with enhanced RC values compared with those of Gd5 Ge1.9Si2 ***-△SM and RC values,negligible coercive force and hysteresis commonly make these Fe78-xREx-Si4 Nb5 B12Cu1 amorphous alloys as low-cost candidates for high-temperature magnetic refrigeration.

关键词： Magnetic properties Magnetocaloric effect Refrigeration capacity Rare earths

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Magnetic properties and magnetic entropy changes of MRE_2Co_7 compounds

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Science China(Physics,Mechanics & Astronomy) 2015年第9期58卷 86-89页

作者： ZHONG XiChun LIU ZhongWu MIN JiXiong tian huacun GSCHNEIDNER Jr Karl A PECHARSKY Vitalij K School of Materials Science and Engineering South China University of Technology Ames Laboratory U.S. Department of Energy and Department of Materials Science and Engineering Iowa State University State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering Sun Yat-sen University

(La0.5Ce0.5)2Co7 and(Ce0.65Pr0.35)2Co7 compounds for magnetic refrigeration were studied by X-ray diffraction, ac susceptibility and isothermal magnetization measurements. X-ray powder diffraction shows that all the compounds have hexagonal Ce2Ni7-type structure. The Curie temperatures(TC) are 258 K and 222 K for(La0.5Ce0.5)2Co7 and(Ce0.65Pr0.35)2Co7 compounds, respectively. High coercivities(HC) of about 1.74 and 6.61 k Oe at 5 K with a smooth demagnetization curves were obtained for the(La0.5Ce0.5)2Co7 and(Ce0.65Pr0.35)2Co7 compounds, respectively. For an applied field change from 0 to 50 k Oe, the maximum(??SM) for(La0.5Ce0.5)2Co7 and(Ce0.65Pr0.35)2Co7 compounds are 0.52 and 0.67 J/(kg K), respectively.

关键词： (La0.5Ce0.5)2Co7 compound (Ce0.65Pr0.35)2Co7 compound magnetic property magnetic entropy change

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Structure,magnetic properties and magnetocaloric effects of Fe_(50)Mn_(15-x)Co_xNi_(35) alloys

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Science China(Physics,Mechanics & Astronomy) 2014年第3期57卷 437-441页

作者： ZHONG XiChun tian huacun TANG PengFei LIU ZhongWu ZHENG ZhiGang ZENG DeChang School of Materials Science and Engineering South China University of Technology

FesoMn15-xCoxNi35 （x=0, 1, 3, 5, 7） alloys were prepared by arc melting under purified argon atmosphere. The ingots were homogenized at 930℃ 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 Fe50Mn10CosNi35 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, FesoMnls-xCoxNi35 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.

关键词： Fes0Mnl5-xCoxNi35 alloys magnetic refrigeration Curie temperature magnetocaloric effect

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