Magnetic properties and large magnetocaloric effect in Gd-Ni amorphous ribbons for magnetic refrigeration applications in intermediate temperature range

作者：Zhong X C^*; Tang P F; Liu Z W; Zeng D C; Zheng Z G; Yu H Y; Qiu W Q; Zou M

来源：Journal of Alloys and Compounds, 2011, 509(24): 6889-6892.

DOI：10.1016/j.jallcom.2011.03.173

• Gd-Ni amorphous alloys
• Melt spinning
• Magnetocaloric effect
• Magnetic refrigeration

Amorphous Gd(68-x)Ni(32 x) (x = -3, 0, 3) ribbons were prepared by melt-spinning method. The crystallization onset temperatures T(x1) for Gd(68-x)Ni(32 x) amorphous ribbons with x = -3, 0, and 3 are 561, 568, and 562 K, respectively. All the samples undergo the second-order magnetic transition at temperatures between similar to 122 (x = -3 and 3) and 124K (x = 0). The Curie temperature T(C) does not change with the composition significantly. The maximum isothermal magnetic entropy changes (-Delta S(M))(max) of Gd(71)Ni(29), Gd(68)Ni(32), and Gd(65)Ni(35) amorphous ribbons for a magnetic field change of 0-5 T were 9.0, 8.0, and 6.9 J kg(-1) K(-1), respectively. Large values of the refrigerant capacity (RC) were obtained in these ribbons. For example, Gd(71)Ni(29) amorphous ribbon has a maximum RC value of 724 J kg(-1). Large magnetic entropy change and RC values together with high stability enable the Gd(71)Ni(29) amorphous alloy a competitive candidate among the magnetic refrigeration materials working at temperatures near 120 K.

• 出版日期2011-6-16
• 单位华南理工大学