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Phonon-glass electron-crystal behaviour by A site disorder in n-type thermoelectric oxides

Daniels, L. M.; Savvin, S. N.; Pitcher, M. J.; Dyer, M. S.; Claridge, J. B.; Ling, S.; Slater, B.; Cor�, F.; Alaria, J.; Rosseinsky, M. J.

Authors

L. M. Daniels

S. N. Savvin

M. J. Pitcher

M. S. Dyer

J. B. Claridge

B. Slater

F. Cor�

J. Alaria

M. J. Rosseinsky



Abstract

© 2017 The Royal Society of Chemistry. Phonon-glass electron-crystal (PGEC) behaviour is realised in La0.5Na0.5Ti1-xNbxO3 thermoelectric oxides. The vibrational disorder imposed by the presence of both La3+ and Na+ cations on the A site of the ABO3 perovskite oxide La0.5Na0.5TiO3 produces a phonon-glass with a thermal conductivity, κ, 80% lower than that of SrTiO3 at room temperature. Unlike other state-of-the-art thermoelectric oxides, where there is strong coupling of κ to the electronic power factor, the electronic transport of these materials can be optimised independently of the thermal transport through cation substitution at the octahedral B site. The low κ of the phonon-glass parent is retained across the La0.5Na0.5Ti1-xNbxO3 series without disrupting the electronic conductivity, affording PGEC behaviour in oxides.

Journal Article Type Article
Acceptance Date Aug 2, 2017
Online Publication Date Aug 2, 2017
Publication Date Sep 1, 2017
Deposit Date Nov 20, 2018
Journal Energy and Environmental Science
Print ISSN 1754-5692
Electronic ISSN 1754-5706
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 10
Issue 9
Pages 1917-1922
DOI https://doi.org/10.1039/c7ee01510k
Public URL https://nottingham-repository.worktribe.com/output/1287707
Publisher URL https://pubs.rsc.org/en/Content/ArticleLanding/2017/EE/C7EE01510K#!divAbstract