1. Natural nanostructure and superlattice nanodomains in AgSbTe2.
- Author
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Carlton, Christopher E., De Armas, Ricardo, Jie Ma, May, Andrew F., Delaire, Olivier, and Yang Shao-Horn
- Subjects
- *
NANOSTRUCTURES , *SUPERLATTICES , *THERMAL conductivity , *ELECTRON microscopy , *DENSITY functionals - Abstract
AgSbTe2 has long been of interest for thermoelectric applications because of its favorable electronic properties and its low lattice thermal conductivity of ∼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 ∼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. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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