Abstract
For thermoelectric applications at high temperatures, perovskite SrTiO3 is a promising contender as an n-type oxide thermoelectric (TE) material. In this work, SrxLa0.1TiO3−δ/TiO2−y composite ceramics were successfully synthesized by solid state reaction, using a combination of A-site cation vacancy and composite fabrication. Through X-ray diffractometer and scanning electron microscopy analysis, a complex microstructure composed of two kinds of titanium oxides was formed after reductive sintering and annealing. In addition, controlling the content of Sr vacancies in the SrxLa0.1TiO3−δ matrix increased the thermoelectric power factor (PF) by optimizing the weighted mobility in the composite, resulting in the highest PF of 425.8 μW m−1 K−2 and the maximum ZT of 0.16 for the Sr0.875La0.1TiO3−δ/TiO2−y composite through the synergistic optimization of electrical and thermal transport properties. The strategy proposed in this study of design A-site-deficient composites with nano-sized metal paved a new way to fabricate high performance oxide thermoelectric materials.
Original language | English |
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Pages (from-to) | 4717-4728 |
Number of pages | 12 |
Journal | Journal of the American Ceramic Society |
Volume | 107 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2024 |
Keywords
- A-site deficiency
- composites
- SrTiO thermoelectrics
- thermoelectric performance