期刊
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
卷 223, 期 -, 页码 185-193出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2017.06.014
关键词
Ceramics Soft chemistry synthesis; Solid state reaction; Microstructure; Thermoelectric
资金
- German Federal Ministry of Education and Research [03FH003I2]
- Studienstiftung des deutschen Volkes (Germany)
Ceramics of Ca0.96Gd0.04MnO3-delta are prepared via different soft chemistry methods and the solid state route. The phase formation processes of the synthesized powders are compared, and the effects of powder morphology and sintering behavior on the microstructure and thermoelectric properties of the ceramics are investigated. Ceramic powders with particle size of 110 nm are obtained from soft chemistry routes. These powders show excellent phase purity and shrink at lower temperatures compared to solid state route powders. Dense ceramics with 1 gm mean grain size, homogeneous dopant distribution and good thermoelectric properties are obtained after sintering at 1200 degrees C. Soft chemistry synthesized samples show a figure of merit ZT = 0.14 at 700 degrees C. This is higher than the figure of merit of solid state route ceramics, due to a more homogeneous microstructure, better densification and, hence, improved electrical properties. The soft chemistry synthesis methods provide ceramics with comparable thermoelectric performances. (C) 2017 Elsevier B.V. All rights reserved.
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