Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8001005 | Journal of Alloys and Compounds | 2014 | 5 Pages |
Abstract
Polycrystalline Ca3âxBixCo4âyFeyO9+δ (x = 0, y = 0; x = 0.3, y = 0; x = 0.3, y = 0.1) samples have been prepared by solid state reaction followed by spark plasma sintering process. The thermoelectric properties have been systematically investigated from room temperature to near 1000 K. It is found that Bi substitution leads up to 40% reduction in the thermal conductivity, which is mainly associated with doping-induced point defect phonon scattering. In addition, the power factor was found to be increased by â¼33% by the co-doping of Fe and Bi. In present study, the thermoelectric figure of merit achieves â¼0.4 at 973 K by the co-doped sample Ca2.7Bi0.3Co3.9Fe0.1O9+δ. It indicates that the combined effects of such a co-doping approach can effectively improve the thermoelectric performance of Ca3Co4O9+δ-based material.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Ruoming Tian, Tianshu Zhang, Dewei Chu, Richard Donelson, Li Tao, Sean Li,