Natural nanostructure and superlattice nanodomains in AgSbTe{sub 2}

AgSbTe{sub 2} has long been of interest for thermoelectric applications because of its favorable electronic properties and its low lattice thermal conductivity of ∼0.7 W/mK. In this work, we report new findings from a high-resolution transmission electron microscopy study revealing two nanostructure...

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Bibliographic Details
Published in:Journal of applied physics 2014-04, Vol.115 (14)
Main Authors: Carlton, Christopher E., De Armas, Ricardo, Shao-Horn, Yang, Ma, Jie, May, Andrew F., Delaire, Olivier
Format: Article
Language:English
Subjects:
ANTIMONIDES
CATIONS
CONCENTRATION RATIO
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL LATTICES
DENSITY FUNCTIONAL METHOD
DOMAIN STRUCTURE
MONOCRYSTALS
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
PHONONS
POINT DEFECTS
SILVER TELLURIDES
SUPERLATTICES
THERMAL CONDUCTIVITY
TRANSMISSION ELECTRON MICROSCOPY
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Summary:AgSbTe{sub 2} has long been of interest for thermoelectric applications because of its favorable electronic properties and its low lattice thermal conductivity of ∼0.7 W/mK. In this work, we report new findings from a high-resolution transmission electron microscopy study revealing two nanostructures in single crystal Ag{sub 1−x}Sb{sub 1+x}Sb{sub 2+x} (with x = 0, 0.1, 0.2); (i) a rippled natural nanostructure with a period of ∼2.5–5 nm 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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4870576