Phase transition and magnetocaloric effect of Ni_(55.2)Mn_(18.6)Ga_(26.2-x)Gd_x (x=0, 0.05, 0.15) alloys
来源期刊：JOURNAL OF RARE EARTHS2009年第5期
论文作者：BAO Bo DUAN Jingfang LONG Yi WAN Farong YE Rongchang WU Guangheng
Key words：NiMnGa; magnetocaloric effect (NICE); magnetic transition; structural transition; magnetic entropy change; rare earths;
Abstract: Phase transition process and magnetic entropy change -ΔS of Ni_(55.2)Mn_(18.6)Ga_(26.2-x)Gdx(x=0, 0.05, 0.15) alloys were studied.Ni_(55.2)Mn_(18.6)Ga_(26.2-x)Gd_x(x=0, 0.05, 0.15) alloys still underwent simultaneous structural and magnetic transitions and transform from ferro-magnetic martensitic phase to paramagnetic austenitic phase during heating. Under a field of 2 T, the maximum magnetic entropy change -ΔSM of Ni_(55.2)Mn_(18.6)Ga_(26.15_Gd_(0.05) alloy was 7.7 J/kg.K at 317 K during heating and 8.6 J/kg.K at 314 K during cooling while it was 11.8 J/kg.K at 317 K in Ni_(55.2)Mn_(18.6)Ga_(26.05)Gd_(0.15)alloy during heating.
BAO Bo1，DUAN Jingfang1，LONG Yi1，WAN Farong1，YE Rongchang1，WU Guangheng2
(1.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2.Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China)
Abstract:Phase transition process and magnetic entropy change -ΔS of Ni_(55.2)Mn_(18.6)Ga_(26.2-x)Gdx(x=0, 0.05, 0.15) alloys were studied.Ni_(55.2)Mn_(18.6)Ga_(26.2-x)Gd_x(x=0, 0.05, 0.15) alloys still underwent simultaneous structural and magnetic transitions and transform from ferro-magnetic martensitic phase to paramagnetic austenitic phase during heating. Under a field of 2 T, the maximum magnetic entropy change -ΔSM of Ni_(55.2)Mn_(18.6)Ga_(26.15_Gd_(0.05) alloy was 7.7 J/kg.K at 317 K during heating and 8.6 J/kg.K at 314 K during cooling while it was 11.8 J/kg.K at 317 K in Ni_(55.2)Mn_(18.6)Ga_(26.05)Gd_(0.15)alloy during heating.
Key words:NiMnGa; magnetocaloric effect (NICE); magnetic transition; structural transition; magnetic entropy change; rare earths;
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