Reducing extrinsic hysteresis in first-order La(Fe,Co,Si)13 magnetocaloric systems
Reducing extrinsic hysteresis in first-order La(Fe,Co,Si)13 magnetocaloric systems
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DOI：
10.1063/1.3276565
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发表时间：
2009-12-21
影响因子：
4
通讯作者：
Cohen, L. F.
中科院分区：
文献类型：
--
作者：
Moore, J. D.;Morrison, K.;Cohen, L. F.
同时测量了La(Fe1-x-yCoxSiy)(13)样品的磁化强度和样品温度作为磁场和磁场扫描速率的函数，研究了这些条件对La(Fe1-x-yCoxSiy)(13)样品磁热转变滞后的影响。在表现出一级转变的化合物中，大的磁热效应导致明显偏离等温条件，导致动态扫描速率相关的磁滞回。在这里，我们展示了如何通过改变样品的几何形状或使用只显示二级跃迁的材料来大大减少这种有害的影响。强调了磁化数据中非等温条件的关键特征。(C)2009年美国物理研究所。[DOI：10.1063/1.3276565]
Simultaneous magnetization and sample temperature measurements were performed as a function of magnetic field and magnetic field sweep-rates to study the influence of these conditions on the hysteresis of the magnetocaloric transition in La (Fe1-x-yCoxSiy)(13) samples. The large magnetocaloric effect in the compounds that show a first-order transition cause a significant departure from isothermal conditions leading to dynamic sweep-rate dependent magnetic hysteresis. Here we show how this deleterious effect can be greatly reduced by changing the sample geometry or by use of materials which show a second-order transition only. The key signatures of nonisothermal conditions in the magnetization data are highlighted. (C) 2009 American Institute of Physics. [doi:10.1063/1.3276565]