Microstructure and thermoelectric properties of Sr0.9La0.1TiO3 ceramics with nano-sized metal particles as additive

Reference Presenter Authors
(Institution)
Abstract
06-150 Mengjie Qin Qin, M.(Northwestern Polytechnical University);      Sr0.9La0.1TiO3 thermoelectric ceramics with nano-sized Ag (Sr0.9La0.1TiO3/xAg, x=0.05, 0.10, 0.15, 0.20) and Ti (Sr0.9La0.1TiO3/yTi, y=0.05, 0.10, 0.15, 0.20, 0.30) metal particles as additives were prepared by conventional solid state reaction method, and the influences of metal particles adding content on the microstructure and thermoelectric properties had been investigated. XRD characterization confirmed that the main phase was perovskite Sr0.9La0.1TiO3, accompanying with a small amount of metal phase. SEM images showed that all samples were dense, and the metal particles accumulated at the grain boundaries, which can form a percolating network, contributing to increase the electrical conductivity. Raman spectra of samples before and after annealing in Ar+C atmosphere showed a great difference, resulting from the creation of oxygen vacancies and changes in the Ti-O bond vibration and rotation modes. Adding nano-sized metal particles can increase the electrical conductivity and improve thermoelectric properties effectively. The maximum ZT value of 0.4 was obtained for Sr0.9La0.1TiO3/0.20Ti samples at 1073 K, accompanying with the relative high Seebeck coefficient of -305 μV/K and low thermal conductivity of 1.31 W/m/K. This work suggested a route for using nano-sized metal particles to enhance thermoelectric properties of oxide thermoelectric ceramics.
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