Giant and Reversible Inverse Barocaloric Effects near Room Temperature in Ferromagnetic MnCoGeB0.03
Giant and Reversible Inverse Barocaloric Effects near Room Temperature in Ferromagnetic MnCoGeB0.03
复制标题
DOI：
10.1002/adma.201903577
复制
发表时间：
2019-08-05
影响因子：
29.4
通讯作者：
Moya, Xavier
中科院分区：
文献类型：
--
作者：
Aznar, Araceli;Lloveras, Pol;Moya, Xavier
流体静压代表了在脆性磁热材料中驱动热效应的廉价且实用的方法，所述脆性磁热材料显示一阶磁结构相变，其大潜热传统上使用施加的磁场来获取。在这里，适度的流体静压力的变化是用来驱动巨大的和可逆的逆压热效应在室温附近的臭名昭著的脆性磁热材料MnCoGeB0.03。压热效应与磁性的压热材料中观察到的效果相比是有利的。不可避免的破碎提供了一个大的表面，用于与压力传递介质进行热交换，从而允许在冷却装置中很好地获得压热效应。
Hydrostatic pressure represents an inexpensive and practical method of driving caloric effects in brittle magnetocaloric materials, which display first-order magnetostructural phase transitions whose large latent heats are traditionally accessed using applied magnetic fields. Here, moderate changes of hydrostatic pressure are used to drive giant and reversible inverse barocaloric effects near room temperature in the notoriously brittle magnetocaloric material MnCoGeB0.03. The barocaloric effects compare favorably with those observed in barocaloric materials that are magnetic. The inevitable fragmentation provides a large surface for heat exchange with pressure-transmitting media, permitting good access to barocaloric effects in cooling devices.