Physics – Condensed Matter – Materials Science
Scientific paper
2011-06-09
JOURNAL OF APPLIED PHYSICS 109, 083722 (2011)
Physics
Condensed Matter
Materials Science
13 pages, 2 figures
Scientific paper
10.1063/1.3581155
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.
Hagen M. E.
Li Qian
Llobet Anna
Manley M. E.
Shapiro Sergei
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