期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 4, 期 24, 页码 5806-5813出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc00810k
关键词
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资金
- National 973 Projects of China [2015CB654602]
- Natural Science Foundation of China [51301084, 51431006, 11374155]
- Natural Science Foundation of Jiangsu, China [BK20130576]
- Nanjing University
- Solid State Solar Thermal Energy Conversion Center (S3TEC)'', an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Science [DE-SC0001299]
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.
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