Particle size dependent hysteresis loss in La0.7Ce0.3Fe11.6Si1.4C0.2 first-order systems
Particle size dependent hysteresis loss in La0.7Ce0.3Fe11.6Si1.4C0.2 first-order systems
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La0.7Ce0.3Fe11.6Si1.4C0.2 一阶系统中与粒径相关的滞后损失
DOI：
10.1063/1.3684244
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发表时间：
2012-02-13
影响因子：
4
通讯作者：
Shen, B. G.
中科院分区：
文献类型：
--
作者：
Hu, F. X.;Chen, L.;Shen, B. G.
在这里，我们报道了La0.7Ce0.3Fe11.6Si1.4C0.2中颗粒尺寸相关的磁滞损耗。磁滞损耗随颗粒尺寸的减小而减小。当样品从散装研磨成小颗粒(20-50微米)时，还原比率可高达61%。这种还原可以归因于样品比表面积的显著增加和内部应变和晶界的部分消除，而不是形核因素和电子能带结构。同时，熵变垂直条增量S垂直条略有减少，但由于滞回损失显著减小，有效制冷量有所增加。我们的研究还揭示了颗粒大小的限制。当粒度小于10微米(平均约为4微米)时，样品可能会失去稳定性，三角洲S垂条明显减少。(C)2012年美国物理研究所。[DOI：10.1063/1.3684244]
Here, we report particle size dependent hysteresis loss in La0.7Ce0.3Fe11.6Si1.4C0.2. Hysteresis loss was getting smaller with reducing the particle size. The reduced ratio can be as high as similar to 61% as the sample is ground from bulk into small particles (20-50 mu m). Such reduction can be ascribed to the notably increased surface area of sample and the partially removed internal strain and grain boundaries, other than nucleation factors and electronic band structure. Meanwhile, entropy change vertical bar Delta S vertical bar slightly decreases, but the effective refrigeration capacity shows an increase due to the notable reduction of hysteresis loss. Our investigations also reveal particle size limitation. When the size is below 10 mu m (average similar to 4 mu m), the sample may lose its stability and the vertical bar Delta S vertical bar notably reduces. (C) 2012 American Institute of Physics. [doi:10.1063/1.3684244]