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

fYear

2006

fDate

6-10 Aug. 2006

Firstpage

662

Lastpage

665

Abstract

P-type thermoelectric materials based on magnetite have been obtained by cobalt substitution (Co_xFe_3-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 Co_1.5Fe_1.5-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; (Ni_yCo_1-y)_xFe_3-x-O ₄; 973 K; Co_1.5Fe_1.5-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;

fLanguage

English

Publisher

ieee

Conference_Titel

Thermoelectrics, 2006. ICT '06. 25th International Conference on

Conference_Location

Vienna

ISSN

1094-2734

Print_ISBN

1-4244-0810-5

Electronic_ISBN

1094-2734

Type

conf

DOI

10.1109/ICT.2006.331228

Filename

4133380