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

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.

Citation

Daniels, L. M., Savvin, S. N., Pitcher, M. J., Dyer, M. S., Claridge, J. B., Ling, S., …Rosseinsky, M. J. (2017). Phonon-glass electron-crystal behaviour by A site disorder in n-type thermoelectric oxides. Energy and Environmental Science, 10(9), 1917-1922. https://doi.org/10.1039/c7ee01510k

• 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