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

F Azough and R Freer and SR Yeandel and JD Baran and M Molinari and SC Parker and E Guilmeau and D Kepaptsoglou and Q Ramasse and A Knox and D Gregory and D Paul and M Paul and A Montecucco and J Siviter and P Mullen and WG Li and G Han and EA Man and H Baig and T Mallick and N Sellami and G Min and T Sweet, JOURNAL OF ELECTRONIC MATERIALS, 45, 1894-1899 (2016).

DOI: 10.1007/s11664-015-4275-6

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 S-1000K = 210 mu V/K, electrical conductivity of sigma(1000K) = 60 S/cm, and thermal conductivity of k(1000K) = 1.45 W/(m K), leading to a ZT value of 0.16 at 1000 K.

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