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

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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 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.

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

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Publication details

The article was received on 31 May 2017, accepted on 02 Aug 2017 and first published on 02 Aug 2017


Article type: Communication
DOI: 10.1039/C7EE01510K
Citation: Energy Environ. Sci., 2017, Advance Article
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    Phonon-glass electron-crystal behaviour by A site disorder in n-type thermoelectric oxides

    L. M. Daniels, S. N. Savvin, M. J. Pitcher, M. S. Dyer, J. B. Claridge, S. Ling, B. Slater, F. Corà, J. Alaria and M. J. Rosseinsky, Energy Environ. Sci., 2017, Advance Article , DOI: 10.1039/C7EE01510K

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