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Title: Anharmonicity and atomic distribution of SnTe and PbTe thermoelectrics

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [2];  [1];  [2];  [2];  [3];  [3];  [2];  [3];  [4];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Lujan Center

The structure and lattice dynamics of rock-salt thermoelectric materials SnTe and PbTe are investigated with single crystal and powder neutron diffraction, inelastic neutron scattering (INS), and first-principles simulations. Our first-principles calculations of the radial distribution function (RDF) in both SnTe and PbTe show a clear asymmetry in the first nearest-neighbor (1NN) peak, which increases with temperature, in agreement with experimental reports (Ref. 1,2). We show that this peak asymmetry for the 1NN Sn–Te or Pb–Te bond results from large-amplitude anharmonic vibrations (phonons). No atomic off-centering is found in our simulations. In addition, the atomic mean square displacements derived from our diffraction data reveal stiffer bonding at the anion site, in good agreement with the partial phonon densities of states from INS, and first-principles calculations. In conclusion, these results provide clear evidence for large-amplitude anharmonic phonons associated with the resonant bonding leading to the ferroelectric instability.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; SC0001299; AC52-06NA25396
OSTI ID:
1286750
Alternate ID(s):
OSTI ID: 1180716
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 21; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 63 works
Citation information provided by
Web of Science

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Cited By (17)

Eco-Friendly SnTe Thermoelectric Materials: Progress and Future Challenges journal September 2017
Chalcogenide Thermoelectrics Empowered by an Unconventional Bonding Mechanism journal August 2019
Manipulation of Phonon Transport in Thermoelectrics journal February 2018
Neutron Instruments for Research in Coordination Chemistry: Neutron Instruments for Research in Coordination Chemistry journal January 2019
Enhanced power factor in the promising thermoelectric material SnPb x Te prepared via zone-melting journal January 2015
Optimization of peak and average figures of merits for In & Se co-doped SnTe alloys journal January 2018
A cubic room temperature polymorph of thermoelectric TAGS-85 journal January 2018
Thermoelectric stability of Eu- and Na-substituted PbTe journal January 2018
High thermoelectric performance of Ag doped SnTe polycrystalline bulks via the synergistic manipulation of electrical and thermal transport journal January 2019
Outstanding thermoelectric properties of solvothermal-synthesized Sn 1−3x In x Ag 2x Te micro-crystals through defect engineering and band tuning journal January 2020
The cold neutron chopper spectrometer at the Spallation Neutron Source—A review of the first 8 years of operation journal September 2016
A suite-level review of the neutron powder diffraction instruments at Oak Ridge National Laboratory journal September 2018
Modulation of thermal conductivity and thermoelectric figure of merit by anharmonic lattice vibration in Sb 2 Te 3 thermoelectrics journal December 2018
Rationalizing phonon dispersion for lattice thermal conductivity of solids journal September 2018
Investigation of the electronic structure and lattice dynamics of the thermoelectric material Na-doped SnSe journal September 2018
Chalcogenide Thermoelectrics Empowered by an Unconventional Bonding Mechanism text January 2019
From atomic layer to the bulk: low-temperature atomistic structure, ferroelectric and electronic properties of SnTe films text January 2019

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