Ba6−3xNd8+2xTi18O54 Tungsten Bronze: A New High-Temperature n-Type Oxide Thermoelectric

Feridoon Azough, Robert Freer, Stephen R. Yeandel, Jakub D. Baran, Marco Molinari, Stephen C. Parker, Emmanuel Guilmeau, Demie Kepaptsoglou, Quentin Ramasse, Andy Knox, Duncan Gregory, Douglas Paul, Manosh Paul, Andrea Montecucco, Jonathan Siviter, Paul Mullen, Wenguan Li, Guang Han, Elena A. Man, Hasan BaigTapas Mallick, Nazmi Sellami, Gao Min, Tracy Sweet

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Abstract

Semiconducting Ba6−3xNd8+2xTi18O54 ceramics (with x = 0.00 to 0.85) were synthesized by the mixed oxide route followed by annealing in a reducing atmosphere; their high-temperature thermoelectric properties have been investigated. In conjunction with the experimental observations, atomistic simulations have been performed to investigate the anisotropic behavior of the lattice thermal conductivity. The ceramics show promising n-type thermoelectric properties with relatively high Seebeck coefficient, moderate electrical conductivity, and temperature-stable, low thermal conductivity; For example, the composition with x = 0.27 (i.e., Ba5.19Nd8.54Ti18O54) exhibited a Seebeck coefficient of S1000K = 210 µV/K, electrical conductivity of σ1000K = 60 S/cm, and thermal conductivity of k1000K = 1.45 W/(m K), leading to a ZT value of 0.16 at 1000 K.

Original languageEnglish
Pages (from-to)1894-1899
Number of pages6
JournalJournal of Electronic Materials
Volume45
Issue number3
Early online date30 Dec 2015
DOIs
Publication statusPublished - Mar 2016
Externally publishedYes

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    Azough, F., Freer, R., Yeandel, S. R., Baran, J. D., Molinari, M., Parker, S. C., Guilmeau, E., Kepaptsoglou, D., Ramasse, Q., Knox, A., Gregory, D., Paul, D., Paul, M., Montecucco, A., Siviter, J., Mullen, P., Li, W., Han, G., Man, E. A., ... Sweet, T. (2016). Ba6−3xNd8+2xTi18O54 Tungsten Bronze: A New High-Temperature n-Type Oxide Thermoelectric. Journal of Electronic Materials, 45(3), 1894-1899. https://doi.org/10.1007/s11664-015-4275-6