Please use this identifier to cite or link to this item:
- Impedance spectroscopy of SnO2: CoO during sintering
- Universidade Federal de São Carlos (UFSCar)
- Universidade Estadual Paulista (UNESP)
- SnO2:m mol% CoO (0.5 less than or equal to m less than or equal to 6.0) ceramic specimens were studied by impedance spectroscopy in the 5 Hz-13 MHz frequency range during heating cold-pressed specimens from room temperature to 1250 degrees C. The electrical resistivity during sintering decreases from 4 to 6 orders of magnitude in the 400-1500 K temperature range depending on the amount of CoO. An increase in electrical resistivity in the 570-670 K range is related to the release of adsorbed water. The results for the 970-1500 K show that the higher the amount of the CoO addition, the lower is the temperature at which SnO2:CoO reaches a minimum electrical resistivity. This suggests that oxygen point defects created by dissolution of cobalt ions in the SnO2 lattice are controlling the densification rate of these ceramics.
- Materials Letters. Amsterdam: Elsevier B.V., v. 30, n. 1, p. 125-130, 1997.
- Elsevier B.V.
- tin oxide
- cobalt oxide dopant
- impedance spectroscopy
- sintering aids
- Acesso restrito
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.