Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1477426 | Journal of the European Ceramic Society | 2008 | 7 Pages |
Abstract
The nonlinear electrical properties of CoO-doped SnO2 ceramics were characterized. A second phase is observed at the surface of the microstructure of the specimens. Energy-dispersive X-ray analysis reveals that the second phase is composed of tin, cobalt and oxygen with an approximate atomic ratio estimated for Co and Sn: 2:1. The phase was identified by X-ray diffraction and unambiguously establish the identity of the phase: Co2SnO4. Electrical characterization of the binary CoO–SnO2 was carried out on a very large range of current from 10−9 up to 100 A cm−2 showing that the doping of CoO increases drastically the resistivity of the ceramic from 104 to 1010 Ω cm. This value appears to be a threshold for which the nonlinear effect appears.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
R. Metz, D. Koumeir, J. Morel, J. Pansiot, M. Houabes, M. Hassanzadeh,