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

Daniels, LM ORCID: 0000-0002-7077-6125, Savvin, SN, Pitcher, MJ ORCID: 0000-0003-2044-6774, Dyer, MS ORCID: 0000-0002-4923-3003, Claridge, JB ORCID: 0000-0003-4849-6714, Ling, S, Slater, B, Cora, F, Alaria, J ORCID: 0000-0001-5868-0318 and Rosseinsky, MJ ORCID: 0000-0002-1910-2483 (2017) Phonon-glass electron-crystal behaviour by A site disorder in n-type thermoelectric oxides ENERGY & ENVIRONMENTAL SCIENCE, 10 (9). pp. 1917-1922. ISSN 1754-5692, 1754-5706

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Abstract

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 ABO(3) perovskite oxide La0.5Na0.5TiO3 produces a phononglass with a thermal conductivity, kappa, 80% lower than that of SrTiO3 at room temperature. Unlike other state-of-the-art thermoelectric oxides, where there is strong coupling of kappa 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 kappa of the phonon-glass parent is retained across the La0.5Na0.5Ti1-xNbxO3 series without disrupting the electronic conductivity, affording PGEC behaviour in oxides.

Item Type:	Article
Uncontrolled Keywords:	51 Physical Sciences, 34 Chemical Sciences, 3406 Physical Chemistry
Depositing User:	Symplectic Admin
Date Deposited:	27 Nov 2017 08:23
Last Modified:	29 Jan 2026 19:56
DOI:	10.1039/c7ee01510k
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3012760
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