Phase transition and magnetocaloric effect of Ni 55.2Mn 18.6Ga 26.2– x Gd x ( x=0, 0.05, 0.15) alloys

• Published in: Journal of rare earths Vol. 27; no. 5; pp. 875 - 878
• Main Authors: BAO, Bo, LONG, Yi, DUAN, Jingfang, WU, Guangheng, YE, Rongchang, WAN, Farong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2009
• Subjects: magnetic entropy change; magnetic transition; magnetocaloric effect (MCE); NiMnGa; rare earths; structural transition; NiMnGa; magnetic entropy change; magnetocaloric effect (MCE); magnetic transition; structural transition; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(08)60353-1

Phase transition process and magnetic entropy change –Δ S of Ni 55.2Mn 18.6Ga 26.2- x Gd x ( x=0, 0.05, 0.15) alloys were studied. Ni 55.2Mn 18.6Ga 26.2– x Gd x ( x=0, 0.05, 0.15) alloys still underwent simultaneous structural and magnetic transitions and transform from ferromagnetic martensitic phase to paramagnetic austenitic phase during heating. Under a field of 2 T, the maximum magnetic entropy change –Δ S M of Ni 55.2Mn 18.6Ga 26.15Gd 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 55.2Mn 18.6Ga 26.05Gd 0.15 alloy during heating.