Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00097 : Neutron Scattering Measurements of Temperature-Dependent Phonon Spectra in Thermoelectric Materials PbTe and (Ag,Sb)Te$_{2}$
Author:
The thermoelectric materials PbTe and (Ag,Sb)Te$_{2}$, which both
crystallize in the rocksalt structure, have attracted much
attention due to
their high \textit{zT} values. Prior theoretical and experimental
studies have investigated the phonon dispersions of PbTe, and the
importance
of the electron-phonon and phonon-phonon couplings has been
recognized.
However, phonons have not been investigated in details in
(Ag,Sb)Te$_{2}$.
Also, little is known about the phonon linewidths, which directly
correlate
with the lattice thermal conductivity. In order to better
understand the
microscopic origins of the lattice thermal conductivity,
time-of-flight and
triple-axis inelastic neutron scattering measurements were
performed as a
function of temperature in both compounds. The results of phonon
linewidths
and their systematic dependence on temperature are presented,
providing a
direct measurement of the contribution of phonons to the total
thermal
conductivity.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.97
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