Lattice dynamical origin of peak thermoelectric performance in AgPb mSbTe2+m observed by inelastic neutron scattering

M. E. Manley; S. Shapiro; Q. Li; A. Llobet; M. E. Hagen

doi:10.1063/1.3581155

Lattice dynamical origin of peak thermoelectric performance in AgPb _mSbTe_2+m observed by inelastic neutron scattering

M. E. Manley, S. Shapiro, Q. Li, A. Llobet, M. E. Hagen

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Phonon densities of states (DOS) for the high performing thermoelectric material, AgPb_mSbTe_2+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.

Original language	English
Article number	083722
Journal	Journal of Applied Physics
Volume	109
Issue number	8
DOIs	https://doi.org/10.1063/1.3581155
State	Published - Apr 15 2011
Externally published	Yes

Funding

This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52–07NA27344. The work at Brookhaven National Laboratory was supported by the U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE-AC02-98CH10886.

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abstract = "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.",

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AU - Li, Q.

AU - Llobet, A.

AU - Hagen, M. E.

PY - 2011/4/15

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AB - 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.

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Lattice dynamical origin of peak thermoelectric performance in AgPb _mSbTe_2+m observed by inelastic neutron scattering

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