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Ba 6−3x Nd 8+2x Ti 18 O 54 Tungsten Bronze A New High-Temperature n-Type Oxide Thermoelectric

Abstract : Semiconducting Ba 6−3x Nd 8+2x Ti 18 O 54 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., Ba 5.19 Nd 8.54 Ti 18 O 54 ) exhibited a Seebeck coefficient of S 1000K  = 210 µV/K, electrical conductivity of σ 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. © 2015, The Author(s).
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F. Azough, R. Freer, S.R. Yeandel, J.D. Baran, M. Molinari, et al.. Ba 6−3x Nd 8+2x Ti 18 O 54 Tungsten Bronze A New High-Temperature n-Type Oxide Thermoelectric. Journal of Electronic Materials, Institute of Electrical and Electronics Engineers, 2016, 45 (3), pp.1894-1899. ⟨10.1007/s11664-015-4275-6⟩. ⟨hal-02184750⟩



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