High superionic conduction arising from aligned large lamellae and large figure of merit in bulk Cu1.94Al0.02Se
High superionic conduction arising from aligned large lamellae and large figure of merit in bulk Cu1.94Al0.02Se
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Cu1.94Al0.02Se 中对齐的大片层和大品质因数产生的高超离子传导
DOI：
10.1063/1.4896520
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发表时间：
2014-09-22
影响因子：
4
通讯作者：
He, Qinyu
中科院分区：
文献类型：
--
作者：
Zhong, Bin;Zhang, Yong;He, Qinyu
良好的热电材料应具有较低的热导率、较高的电导率和塞贝克系数，这在块状材料中很难达到平衡。此外，β-Cu2Se中的超离子可以很好地提供较大的离子电导率和铜离子的液态热导率。在前人的工作中，发现有序的Se离子单层和无序的Cu2+双层交替排列的小的随机取向的片层增强了上离子机制。在这里，我们通过增加和更好地对准块状Cu1.94Al0.02Se中的片层来进一步增强上层机制，从而在756℃时获得2.62的大热电优值。(C)2014 AIP出版有限公司。
Good thermoelectric materials should have low thermal conductivity, high electrical conductivity, and Seebeck coefficient, which cannot be easily balanced in bulk materials. Exceptionally, the super-ionics in beta-Cu2Se can favorably contribute large ionic electrical conductivity and a liquid-like thermal conductivity by Cu+ ions. In the previous work, the superionic mechanism was found to be enhanced by small and randomly orientated lamellae with alternating ordered Se ion monolayer and disordered Cu ion bilayers. Here, we further enhance the superionic mechanism by increasing and better aligning lamellae in bulk Cu1.94Al0.02Se, resulting in a large thermoelectric figure of merit of 2.62 at 756 degrees C. (C) 2014 AIP Publishing LLC.