Title :
P-type thermoelectric properties of sintered (NiyCo1-y)xFe3-xO4 with spinel structure
Author :
Yamamoto, K. ; Machida, K. ; Oikawa, Y. ; Kim, C. ; Ozaki, H.
Author_Institution :
Dept. of Electr. Eng. & Bioscience, Waseda Univ., Tokyo
Abstract :
P-type thermoelectric materials based on magnetite have been obtained by cobalt substitution (CoxFe3-x-xO4 ). For x ges 1.1, Seebeck coefficient (S) was positive and showed a maximum at a temperature which shifted toward high temperature. For x les 1.0, S was negative, and for x ap 1.0, S changes its sign from positive to negative with increasing temperature. The Co content of Co1.5Fe1.5-xO4 yielded a lowest electrical resistivity of 40 mOmegacm at 973K. Effects of Ni and Co co-doping were also discussed
Keywords :
Seebeck effect; atom-molecule reactions; chemical exchanges; cobalt compounds; doping; electrical resistivity; iron compounds; nickel compounds; sintering; (NiyCo1-y)xFe3-x-O 4; 973 K; Co1.5Fe1.5-O4; Seebeck coefficient; cobalt substitution; codoping; electrical resistivity; magnetite; p-type thermoelectric materials; sintering; spinel structure; thermoelectric property; Atmosphere; Cobalt; Current measurement; Electric resistance; Immune system; Magnetic materials; Magnetic properties; Powders; Temperature; Thermoelectricity;
Conference_Titel :
Thermoelectrics, 2006. ICT '06. 25th International Conference on
Conference_Location :
Vienna
Print_ISBN :
1-4244-0810-5
Electronic_ISBN :
1094-2734
DOI :
10.1109/ICT.2006.331228
