Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 735, Issue -, Pages 1096-1104Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.11.195
Keywords
Thermoelectricity; Skutterudite; Very fined grained microstructure; Thermal conductivity; Phonon mean free path; Electron mobility
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Funding
- Agence Nationale pour la Recherche through the contract Nanoskut [ANR 12 - PRGE 0008-01]
- Agence Nationale de la Recherche (ANR) [ANR-12-PRGE-0008] Funding Source: Agence Nationale de la Recherche (ANR)
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The polycrystalline In0.25Co4Sb12 n-type skutterudite was ball-milled to reduce its grain size and lattice thermal conductivity by enhanced phonon scattering at grain boundaries. To inhibit the grain size growth which occurs during the densification by spark plasma sintering, CeO2 nanoparticles (similar to 20 nm) were eventually added. This leads to several highly dense In0.25Co4Sb12 compacts (> 97%) with average grain sizes ( D) ranging from 400 nm to the very small value of 150 nm. When D similar to 150 nm, the lattice thermal conductivity is strongly reduced but any improvement of the dimensionless thermoelectric figure of merit ( ZT) is cancelled out by an obvious decrease of the electron mobility, arising from grain boundary scattering of the electrons. ZT is nonetheless improved from ZT = 1.1 in pristine In0.25Co4Sb12 to ZT = 1.4 at 750 K in In0.25Co4Sb12 with D similar to 400 nm because in this sample, the lattice thermal conductivity is still efficiently reduced while the electron mobility remains unaffected. (C) 2017 Elsevier B.V. All rights reserved.
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