کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1617242 | 1005681 | 2011 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Magnetic properties and large magnetocaloric effect in Gd–Ni amorphous ribbons for magnetic refrigeration applications in intermediate temperature range Magnetic properties and large magnetocaloric effect in Gd–Ni amorphous ribbons for magnetic refrigeration applications in intermediate temperature range](/preview/png/1617242.png)
Amorphous Gd68−xNi32+x (x = −3, 0, 3) ribbons were prepared by melt-spinning method. The crystallization onset temperatures Tx1 for Gd68−xNi32+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 ∼122 (x = −3 and 3) and 124 K (x = 0). The Curie temperature TC does not change with the composition significantly. The maximum isothermal magnetic entropy changes (−ΔSM)max of Gd71Ni29, Gd68Ni32, and Gd65Ni35 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, Gd71Ni29 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 Gd71Ni29 amorphous alloy a competitive candidate among the magnetic refrigeration materials working at temperatures near 120 K.
► We report that the first crystallization temperature Tx1 of Gd68−xNi32+x amorphous ribbons with x = −3, 0, and 3 were 561, 568, and 562 K, respectively.
► All the samples underwent the second-order magnetic transitions at temperatures between ∼122 (x = −3 and 3) and 124 K (x = 0).
► The maximum isothermal magnetic entropy changes (−ΔSM)max of Gd71Ni29, Gd68Ni32, and Gd65Ni35 amorphous ribbons with a magnetic field change of 0–5 T were 9.0, 8.0, and 6.9 J kg−1 k−1, respectively.
► Large refrigerant capacity (RC) values were also obtained in these ribbons. For example, Gd71Ni29 amorphous ribbon has a maximum RC value of 724 J kg−1.
► Large magnetic entropy change and RC values, as well as high stability enable Gd71Ni29 amorphous ribbon to be a competitive candidate among the magnetic refrigeration materials working at temperatures near 120 K.
Journal: Journal of Alloys and Compounds - Volume 509, Issue 24, 16 June 2011, Pages 6889–6892