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Title: Lattice dynamics and thermoelectric properties of nanocrystalline silicon-germanium alloys

The lattice dynamics and thermoelectric properties of sintered phosphorus-doped nanostructured silicon- germanium alloys obtained by gas-phase synthesis were studied. Measurements of the density of phonon states by inelastic neutron scattering were combined with measurements of the elastic constants and the low- temperature heat capacity. A strong influence of nanostructuring and alloying on the lattice dynamics was observed. The thermoelectric transport properties of samples with different doping as well as samples sintered at different temperature were characterized between room temperature and 1000C. A peak figure of merit zT = 0:88 at 900C is observed and comparatively insensitive to the aforementioned param- eter variations.
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [2] ;  [1] ;  [2] ;  [5]
  1. Julich Research Centre (Germany). Julich Centre for Neutron Science (JCNS)
  2. University of Duisburg-Essen (Germany)
  3. Forschungszentrum Julich (Germany)
  4. Inst. Laue-Langevin (ILL), Grenoble (France)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Physica Status Solidi. A, Applications and Materials Science
Additional Journal Information:
Journal Volume: 213; Journal Issue: 3; Journal ID: ISSN 1862-6300
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE; SiGe alloy; thermoelectric; lattice dynamics; transport properties