A coupling of martensitic and metamagnetic transitions with collective magneto-volume and table-like magnetocaloric effects
A coupling of martensitic and metamagnetic transitions with collective magneto-volume and table-like magnetocaloric effects
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DOI：
10.1063/1.4892167
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发表时间：
2014-08
影响因子：
4
通讯作者：
E. Liu;Z. Wei;Y. Li;G. Liu;H. Luo;W. Wang;H. Zhang;G. H. Wu
中科院分区：
文献类型：
--
作者：
E. Liu;Z. Wei;Y. Li;G. Liu;H. Luo;W. Wang;H. Zhang;G. H. Wu
MnNi_（0.8）Fe_（0.2）Ge合金中存在一级顺磁-感应铁磁马氏体相变和二级反铁磁-铁磁变磁相变的耦合。基于这种耦合，由马氏体相变驱动的磁体积效应和由连续的磁相变产生的桌状磁热效应共同出现。利用磁体积效应，确定了体积膨胀马氏体转变中的内应力为350 MPa。磁热效应在室温附近26 K的宽工作温度范围内显示出小的磁滞损耗（5 J kg−1）和大的净制冷剂容量（157 J kg−1）。
A coupling of the first-order paramagnetic-to-induced-ferromagnetic martensitic and the second-order antiferromagnetic-to-ferromagnetic metamagnetic transitions was found in MnNi0.8Fe0.2Ge alloy. Based on the coupling, a magneto-volume effect driven by the martensitic transition and a table-like magnetocaloric effect generated by the successive magnetic phase transitions arise collectively. By using the magneto-volume effect, the internal stress in the volume-expansion martensitic transition was determined at 350 MPa. The magnetocaloric effect, with a wide working temperature range of 26 K around room temperature, shows a small hysteresis loss (5 J kg−1) and a large net refrigerant capacity (157 J kg−1).