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Paul, Douglas
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article
Ba6−3xNd8+2xTi18O54 Tungsten Bronze
Abstract
<p>Semiconducting Ba<sub>6−3x</sub>Nd<sub>8+2x</sub>Ti<sub>18</sub>O<sub>54</sub> 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<sub>5.19</sub>Nd<sub>8.54</sub>Ti<sub>18</sub>O<sub>54</sub>) exhibited a Seebeck coefficient of S<sub>1000K</sub> = 210 µV/K, electrical conductivity of σ<sub>1000K</sub> = 60 S/cm, and thermal conductivity of k<sub>1000K</sub> = 1.45 W/(m K), leading to a ZT value of 0.16 at 1000 K.</p>