Natural nanostructure and superlattice nanodomains in AgSbTe2

Published

Journal Article

AgSbTe2 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 Ag1-xSb1+xSb 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. © 2014 AIP Publishing LLC.

Full Text

Duke Authors

Cited Authors

  • Carlton, CE; De Armas, R; Ma, J; May, AF; Delaire, O; Shao-Horn, Y

Published Date

  • April 14, 2014

Published In

Volume / Issue

  • 115 / 14

Electronic International Standard Serial Number (EISSN)

  • 1089-7550

International Standard Serial Number (ISSN)

  • 0021-8979

Digital Object Identifier (DOI)

  • 10.1063/1.4870576

Citation Source

  • Scopus