High thermoelectric performance of superionic argyrodite compound Ag8SnSe6

被引:86
作者
Li, Lin [1 ,2 ]
Liu, Yuan [3 ,4 ]
Dai, Jiyan [5 ]
Hong, Aijun [1 ,2 ]
Zeng, Min [6 ]
Yan, Zhibo [1 ,2 ]
Xu, Jun [1 ,2 ]
Zhang, Dong [7 ]
Shan, Dan [1 ,2 ]
Liu, Shilei [7 ]
Ren, Zhifeng [3 ,4 ]
Liu, Jun-Ming [1 ,2 ]
机构
[1] Nanjing Univ, Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[3] Univ Houston, Dept Phys, Houston, TX 77204 USA
[4] Univ Houston, TcSUH, Houston, TX 77204 USA
[5] Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China
[6] S China Normal Univ, Inst Adv Mat, Guangzhou 510006, Guangdong, Peoples R China
[7] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Dept Phys, Key Lab Modern Acoust MOE, Nanjing 210093, Jiangsu, Peoples R China
关键词
THERMAL-CONDUCTIVITY; TRANSPORT; ELECTRON; FIGURE; MERIT; PBSE; PBTE;
D O I
10.1039/c6tc00810k
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A good thermoelectric material usually has a high power factor and low thermal conductivity for high figure of merit (ZT), and is also environmentally friendly and economical. Superionic compounds are heavily studied because of their ultra-low thermal conductivity even though the thermal stability remains an issue. In this work, we report a superionic argyrodite compound Ag8SnSe6 as a promising mid-temperature thermoelectric material because of its high ZT and good thermal stability up to 550 degrees C. It is revealed that Ag8SnSe6 exhibits a decent Seebeck coefficient (n-type) and electrical conductivity. At the same time, its thermal conductivity is lower than the glass limit with the thermal capacity CV below 3Nk(B) at high temperature, where N is the Avogadro's number and k(B) the Boltzmann constant. Detailed microstructural and thermodynamic characterization of this compound is performed to understand the electronic and phononic origins of the thermoelectric properties. The highly random ionic occupations in the cubic phase, leading to the molten silver sublattice and phononic mode softening, are responsible for the very low thermal conductivity and ZT similar to 1.1 at 450 degrees C.
引用
收藏
页码:5806 / 5813
页数:8
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