Journal
JOURNAL OF APPLIED PHYSICS
Volume 115, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4870576
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Funding
- S3TEC, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001299]
- U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
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AgSbTe2 has long been of interest for thermoelectric applications because of its favorable electronic properties and its low lattice thermal conductivity of similar to 0.7W/mK. In this work, we report new findings from a high-resolution transmission electron microscopy study revealing two nanostructures in single crystal Ag1-xSb1+xSb2+x (with x = 0, 0.1, 0.2); (i) a rippled natural nanostructure with a period of similar to 2.5-5nm and (ii) superlattice ordered nanodomains consistent with cation ordering predicted in previous density functional theory studies. These nanostructures, combined with point-defects, probably serve as sources of scattering for phonons, thereby yielding a low lattice thermal conductivity over a wide temperature range. (C) 2014 AIP Publishing LLC.
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