Grup de Caracterització de Materials, Departament de Física, EEBE and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Eduard Maristany 10-14, 08019, Barcelona, Catalonia, Spain.
Department of Materials Science, University of Cambridge, Cambridge, CB3 0FS, UK.
Adv Mater. 2019 Sep;31(37):e1903577. doi: 10.1002/adma.201903577. Epub 2019 Aug 5.
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 MnCoGeB . 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.
静水压力代表了一种在脆性磁热材料中产生热效应的廉价且实用的方法，这些材料表现出一级磁结构相变，其巨大的潜热通常是通过外加磁场来实现的。在此，在 notoriously brittle magnetocaloric material MnCoGeB 中，通过适度改变静水压力来驱动室温附近的巨大且可逆的逆压热效应。压热效应与那些在磁性压热材料中观察到的效果相当。不可避免的碎片为与压力传递介质进行热交换提供了一个很大的表面，从而使冷却装置能够很好地实现压热效应。
