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Phonon scattering mechanism in thermoelectric materials revised via resonant x-ray dynamical diffraction

Published online by Cambridge University Press:  22 May 2020

Adriana Valério
Affiliation:
Institute of Physics, University of São Paulo, São Paulo, SP, Brazil
Rafaela F.S. Penacchio
Affiliation:
Institute of Physics, University of São Paulo, São Paulo, SP, Brazil
Maurício B. Estradiote
Affiliation:
Institute of Physics, University of São Paulo, São Paulo, SP, Brazil
Marli R. Cantarino
Affiliation:
Institute of Physics, University of São Paulo, São Paulo, SP, Brazil
Fernando A. Garcia
Affiliation:
Institute of Physics, University of São Paulo, São Paulo, SP, Brazil
Sérgio L. Morelhão*
Affiliation:
Institute of Physics, University of São Paulo, São Paulo, SP, Brazil
Niamh Rafter
Affiliation:
Department of Physics, University of Guelph, Guelph, OntarioN1G 1W2, Canada
Stefan W. Kycia
Affiliation:
Department of Physics, University of Guelph, Guelph, OntarioN1G 1W2, Canada
Guilherme A. Calligaris
Affiliation:
Brazilian Synchrotron Light Laboratory – LNLS/CNPEM, Campinas, SP, Brazil
Cláudio M.R. Remédios
Affiliation:
Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, PA, Brazil
*
Address all correspondence to Sérgio L. Morelhão at morelhao@if.usp.br
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Abstract

Engineering of thermoelectric materials requires an understanding of thermal conduction by lattice and electronic degrees of freedom. Filled skutterudites denote a large family of materials suitable for thermoelectric applications where reduced lattice thermal conduction attributed to localized low-frequency vibrations (rattling) of filler cations inside large cages of the structure. In this work, a multi-wavelength method of exploiting x-ray dynamical diffraction in single crystals of CeFe4P12 is presented and applied to resolve the atomic amplitudes of vibrations. The results suggest that the vibrational dynamics of the whole filler-cage system is the actual active mechanism behind the optimization of thermoelectric properties.

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Type
Research Letters
Copyright
Copyright © Materials Research Society, 2020

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Supplementary material: PDF

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