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Magnetocaloric and Refrigeration Characteristics of Magnetic Composite Material Composed with Gd and Gd1-xHox Alloy
Journal of Superconductivity and Novel Magnetism ( IF 1.8 ) Pub Date : 2020-10-28 , DOI: 10.1007/s10948-020-05739-0
Zhichao Xu , Fupeng Wang , Guoxing Lin

The doping of Ho into Gd can not only adjust the Curie temperature of Gd 1-x Ho x alloy but also enhance the maximal magnetic entropy change. In the present paper, the magnetocaloric characteristics of Gd 1-x Ho x alloys were calculated by means of the de Gennes model, and the isothermal magnetic entropy change of Gd 1-x Ho x ( x  = 0, 0.05, 0.10, 0.15, 0.20) alloys versus temperature curves generally exhibit a caret-like shape. Furthermore, the composite material composed of Gd and Gd 0.80 Ho 0.20 is introduced in order to obtain a gentler entropy change curve over a large temperature span. Consequently, it is found under magnetic field change from 0 to 2 T that the composite composed of Gd and Gd 0.80 Ho 0.20 with 67% mass ratio of Gd possesses a maximal full width at half maxima δT FWHM of the isothermal magnetic entropy change curve which is 87.3 K, with temperature 217.9 K of the cold end at half-width and temperature 305.2 K of the hot end at half-width. In such a case, the maximal magnetic entropy change is 4.17 J/(kgK), relative cooling power (RCP ) is about 360 J/kg, and refrigeration capacity ( RC ) achieves 280.6 J/kg. The results show that the composite magnetocaloric material can largely enhance the material performance for magnetic refrigeration application.

中文翻译:

Gd与Gd1-xHox合金磁性复合材料的磁热及制冷特性

Ho掺杂到Gd中不仅可以调节Gd 1-x Ho x 合金的居里温度,而且可以增强最大磁熵变。本文利用de Gennes模型计算了Gd 1-x Ho x 合金的磁热特性,以及Gd 1-x Ho x 的等温磁熵变( x = 0, 0.05, 0.10, 0.15, 0.20) 合金与温度的曲线通常呈现出类似插入符号的形状。此外,引入了由Gd和Gd 0.80 Ho 0.20 组成的复合材料,以获得在大温度跨度内更平缓的熵变曲线。因此,在磁场从 0 到 2 T 的变化下,发现 Gd 和 Gd 0.80 Ho 0 组成的复合材料。质量比为 67%的 Gd 的 20 等温磁熵变曲线的最大半峰宽 δT FWHM 为 87.3 K,冷端半宽温度为 217.9 K,热端温度为 305.2 K在半宽处。在这种情况下,最大磁熵变为4.17 J/(kgK),相对冷却功率(RCP)约为360 J/kg,制冷量(RC)达到280.6 J/kg。结果表明,复合磁热材料可以大大提高磁制冷应用的材料性能。6 焦/公斤。结果表明,复合磁热材料可以大大提高磁制冷应用的材料性能。6 焦/公斤。结果表明,复合磁热材料可以大大提高磁制冷应用的材料性能。
更新日期:2020-10-28
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