Muccillo, R.Cerri, J. A.Leite, E. R.Longo, Elson [UNESP]Varela, José Arana [UNESP]2014-05-202014-05-201997-01-01Materials Letters. Amsterdam: Elsevier B.V., v. 30, n. 1, p. 125-130, 1997.0167-577Xhttp://hdl.handle.net/11449/39021SnO2: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.125-130engtin oxidecobalt oxide dopantresistivityimpedance spectroscopydilatometrysintering aidsArtigo10.1016/S0167-577X(97)80001-8WOS:A1997WE37100023Acesso restrito