Giant solid-state barocaloric effect in the Ni-Mn-In magnetic shape-memory alloy
Giant solid-state barocaloric effect in the Ni-Mn-In magnetic shape-memory alloy
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DOI：
10.1038/nmat2731
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发表时间：
2010-06-01
期刊：
影响因子：
41.2
通讯作者：
Acet, Mehmet
中科院分区：
文献类型：
--
作者：
Manosa, Lluis;Gonzalez-Alonso, David;Acet, Mehmet
寻找在接近室温时表现出巨大热效应的材料已成为现代材料物理学的一个挑战，人们期望这类材料将为目前基于有害气体蒸气压缩的冷却装置提供一种更新的方法。到目前为止，最有前途的材料是巨磁热材料。在接近环境温度时显示出巨大磁热效应的材料的发现，开辟了将其用于制冷的可能性（1-3）。由于热效应是指通过施加外场实现的等温熵变，因此调节不同的外部参数（如压力和电场）可以产生几种热效应。事实上，最近已经报道了大的电热（4,5）和弹性热(6)效应的发生。在这里，我们展示了对磁性形状记忆合金施加适度的静水压力会产生与这类材料中报道的巨磁热效应相当的热效应。我们预计，在许多经历涉及体积变化的磁结构转变的巨磁热材料中，也会出现类似的压热效应。
The search for materials showing large caloric effects close to room temperature has become a challenge in modern materials physics and it is expected that such a class of materials will provide a way to renew present cooling devices that are based on the vapour compression of hazardous gases. Up to now, the most promising materials are giant magnetocaloric materials. The discovery of materials showing a giant magnetocaloric effect at temperatures close to ambient has opened up the possibility of using them for refrigeration(1-3). As caloric effects refer to the isothermal entropy change achieved by application of an external field, several caloric effects can take place on tuning different external parameters such as pressure and electric field. Indeed the occurrence of large electrocaloric(4,5) and elastocaloric(6) effects has recently been reported. Here we show that the application of a moderate hydrostatic pressure to a magnetic shape-memory alloy gives rise to a caloric effect with a magnitude that is comparable to the giant magnetocaloric effect reported in this class of materials. We anticipate that similar barocaloric effects will occur in many giant-magnetocaloric materials undergoing magnetostructural transitions involving a volume change.