Thermal expansion and thermal conductivity of RT2 (R:Gd,Dy,Er; T:Al,Ni) intermetallic compounds for magnetic refrigerator
Thermal expansion and thermal conductivity of RT2 (R:Gd,Dy,Er; T:Al,Ni) intermetallic compounds for magnetic refrigerator
复制标题
磁制冷机用RT2(R:Gd,Dy,Er;T:Al,Ni)金属间化合物的热膨胀和导热系数
DOI：
10.1088/1742-6596/1857/1/012003
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
NUMAZAWA Takenori (NIMS)
中科院分区：
文献类型：
--
作者：
WATANABE Shota;KOMATSU Shunsuke;FUTATSUKA Kazumi;KUMAZAWA Naoya;MATSUMOTO Koichi (Kanazawa U.); KAMIYA Koji;OYOSHI Keiji;TAKEYA Hiroyuki;NUMAZAWA Takenori (NIMS)
高效的氢液化是未来氢能社会的需要。磁制冷是实现高效氢液化的一种方法，其性能取决于磁性材料的性质。RT 2（R：稀土; T：具有二级磁相变的（Al，Ni）Laves相金属间化合物是一类很有前途的磁热材料。由于ErAl 2、DyNi 2、DyAl 2和GdNi 2具有在磁制冷机中实际应用的重要性质，因此使用多晶样品在磁场中测量了ErAl 2、DyNi 2、DyAl 2和GdNi 2的热膨胀、磁致伸缩和热导率。热膨胀在磁转变温度下表现出异常。然而，在0 T中的那些几乎与铜相同。磁致伸缩不像具有一级磁相变的磁热材料如TbMn 2那样大。在0 T的热导率几乎与文献数据一致，磁场依赖性很小。这些结果表明，RT 2化合物适合作为氢液化的磁制冷剂。
Highly efficient hydrogen liquefaction is required for upcoming hydrogen energy society. Magnetic refrigeration is expected as a method to realize efficient hydrogen liquefaction, and the performance depends on properties of magnetic materials. RT 2 (R: rare-earth; T: Al, Ni) Laves phase intermetallic compounds with a second-order magnetic phase transition are one of the promising magnetocaloric materials. Thermal expansion, magnetostriction, and thermal conductivity of ErAl 2, DyNi 2, DyAl 2 and GdNi 2 were measured in magnetic fields using polycrystalline samples because of the important properties for practical use in a magnetic refrigerator. Thermal expansions showed anomalies at the magnetic transition temperature. However, those in 0 T were nearly the same as copper. Magnetostriction were not as large as magnetocaloric materials with a first-order magnetic phase transition such as TbMn 2. Thermal conductivities in 0 T were almost in agreement with the literature data, and magnetic field dependence was small. These results indicate that RT 2 compounds are suitable as magnetic refrigerants for hydrogen liquefaction in practical use.