Structural and thermoelectric characterizations of samarium filled CoSb3 skutterudites
Structural and thermoelectric characterizations of samarium filled CoSb3 skutterudites
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DOI：
10.1016/j.matlet.2014.12.019
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发表时间：
2015-03
影响因子：
3
通讯作者：
Qian Zhang;Chen Chen-Chen;Yulong Kang;Xiaodong Li;Long Zhang;D. Yu;Yongjun Tian;Bo Xu
中科院分区：
文献类型：
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作者：
Qian Zhang;Chen Chen-Chen;Yulong Kang;Xiaodong Li;Long Zhang;D. Yu;Yongjun Tian;Bo Xu
采用熔融退火法首次在常压下合成了Sm填充的CoSb 3无电荷补偿材料。合成的SmyCo 4Sb 12样品具有Im 3 <$对称的方钴矿结构。Sm引入CoSb 3晶格后，晶格常数略有增大.一个较大的原子位移参数（ADP）被揭示为Sm原子相比，那些Co和Sb原子，表明在超大笼内的Sm原子的晃动模式。热电性能的调查显示，显着压低的热导率所造成的强声子散射从松散的键合Sm填料，同时保持高的电气性能。结果表明，Sm0.6Co4Sb12样品在716 K时获得最大ZT值0.8.
Sm filled CoSb 3 without charge compensation was synthesized at ambient pressure for the first time through a melt-annealing method. The synthetic Sm y Co 4 Sb 12 samples possess an Im 3¯ symmetry of skutterudite structure. The lattice parameter expanded mildly after Sm inclusion into CoSb 3 lattice. A larger atomic displacement parameter (ADP) was revealed for Sm atoms compared with those of Co and Sb atoms, indicating the rattling mode of Sm atoms inside the oversized cages. The thermoelectric property investigations revealed a significantly depressed thermal conductivity caused by the strong phonon scattering from loosely bond Sm fillers while maintaining high electrical performance. As a result, the maximum ZT value of 0.8 was achieved at 716 K for Sm 0.6 Co 4 Sb 12 sample.