Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9781546 | Journal of Physics and Chemistry of Solids | 2005 | 5 Pages |
Abstract
Temperature dependences of the Hall coefficient, Hall mobility and thermoelectric properties of Ni-doped CoSb3 have been characterized over the temperature range from 20 to 773 K. Ni-doped CoSb3 is an n-type semiconductor and the conduction type changes from n-type to p-type at around 450 K. The temperature for the transition from n-type to p-type increased with increasing Ni content x. The Seebeck coefficient reaches a maximum value near the transition temperature. The electrical resistivity indicates that Co1âxNixSb3 is a typical semiconductor when xâ¤0.03 and a degenerate semiconductor when x>0.03. Thermal conductivity analyses show that the lattice component is predominant at lower temperatures and carrier and bipolar components become large at temperatures higher than the transition temperature. The thermoelectric figure of merit reaches a maximum value close to the transition temperature and the largest value, 4.67Ã10â4 Kâ1 at 600 K, was obtained for x=0.05.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Hiroyuki Kitagawa, Machiko Wakatsuki, Hisanori Nagaoka, Hiroyuki Noguchi, Yukihiro Isoda, Kazuhiro Hasezaki, Yasutoshi Noda,