Influence of heat-treatment conditions on the electrical conduction mechanism of grain-boundary in cobalt ferrites

Author

Na, J.G. ; Kim, M.C. ; Lee, T.D. ; Park, S.J.

Author_Institution

Korea Inst. of Sci. & Technol., Seoul, South Korea

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

3520

Lastpage

3522

Abstract

The electrical resistance and conduction mechanism of the grain-boundary in Co_xFe_3-xO₄ (x=0.94, 0.97, 1.00, 1.03 and 1.06) under various heat-treatment conditions have been characterized, using a complex impedance analysis technique. The electrical resistance of cobalt ferrites decreases with increasing quenching temperature, which is mainly attributed to the decrease of R_gb in Fe-excess cobalt ferrites and R_g in Co-excess ones. It is verified that for the furnace-cooled Co_0.94Fe_2.06O₄, the conduction mechanism of the grain and grain-boundary is n-type and p-type, respectively. For furnace-cooled Co_1.06Fe_1.94O₄, the conduction mechanism of the grain and grain-boundary is p-type and n-type, respectively. These results indicate that the resistivity in the p-type part of cobalt ferrites decreases more rapidly than that in the n-type part with increasing quenching temperature

Keywords

cobalt compounds; electrical conductivity of crystalline semiconductors and insulators; ferrites; grain boundaries; quenching (thermal); Co_0.94Fe_2.06O₄; Co_1.06Fe_1.94O₄; Co_xFe_3-xO₄; complex impedance analysis technique; electrical conduction mechanism; electrical resistance; furnace cooled ferrites; grain-boundary; heat-treatment conditions; n-type; p-type; quenching temperature; Cobalt; Conductivity; Electric resistance; Extraterrestrial measurements; Ferrites; Furnaces; Impedance measurement; Network address translation; Resistance heating; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.281216

Filename

281216