Journal
JOURNAL OF APPLIED PHYSICS
Volume 109, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3581155
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- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-98CH10886]
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Phonon densities of states (DOS) for the high performing thermoelectric material, AgPbmSbTe2+m (LAST-m, m = 16, 18, and 20), were extracted from time-of-flight inelastic neutron scattering measurements. The phonon DOS of LAST-18 differs remarkably from LAST-16 and LAST-20 by exhibiting a dramatic broadening of its acoustic modes that increases on heating. This broadening coincides with a minimum in the thermal conductivity, a maximum in the electrical conductivity and Seebeck coefficient, and a related peak in thermoelectric performance. We argue that the anomalous broadening originates with scattering enhanced by modifications to Te-Ag(Sb) bonds caused by their resonant electronic states falling near the Fermi energy for m = 18. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3581155]
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