Thermal conductivity of PrRh4.8B2, a layered boride compound
Thermal conductivity of PrRh4.8B2, a layered boride compound
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DOI：
10.1063/1.5005869
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发表时间：
2017-12-01
期刊：
影响因子：
6.1
通讯作者：
Mori, Takao
中科院分区：
文献类型：
--
作者：
Kakefuda, Yohei;Yubuta, Kunio;Mori, Takao
透射电子显微镜（TEM），比热，和热导率的测量进行了PrRh4.8B2单晶。PrRh4.8B2具有有趣的层状晶体结构，其中PrRh 3B 2块被金属Rh蜂窝层隔开。Rh层的存在提高了铁磁转变温度。根据区域选择性皮秒热反射率，PrRh4.8B2的跨平面热导率估计为1.39 Wm（-1）K-1，远低于其他层状硼化物如AlB 2。从通过TEM获得的精细晶体结构判断，声子传导被认为是由于Rh空位的随机分散和PrRh4.8B2的二维性质而被抑制。(c)2017年作者。
Transmission electron microscopy (TEM), specific heat, and thermal conductivity measurements were carried out for PrRh4.8B2 single crystals. PrRh4.8B2 takes an interesting layered crystal structure, where PrRh3B2 blocks are separated by metal Rh honeycomb layers. The existence of the Rh layers enhances the ferrimagnetic transition temperature. From area-selective picosecond thermoreflectance, the cross-plane thermal conductivity of PrRh4.8B2 is estimated to be 1.39 Wm(-1) K-1, much lower than other layered borides like AlB2. Judging from the fine crystal structures obtained by TEM, phonon conduction is considered to be depressed due to random dispersion of Rh vacancy sites and two-dimensional nature of PrRh4.8B2. (c) 2017 Author(s).