Artigo de peri??dico
Impedance spectroscopy of SnO2: CoO during sintering
Registro en:
0167-577X
1
30
10.1016/S0167-577X(97)80001-8
Autor
MUCCILLO, R.
CERRI, J.A.
LEITE, E.R.
LONGO, E.
VARELA, J.A.
Resumen
SnO2 : m mol% Co0 (0.5 <= m <= 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??C. The electrical resistivity during
sintering decreases from 4 to 6 orders of magnitude in the 400-1.500 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 Co0 addition, the lower is the temperature at which SnO, : Co0 reaches
a minimum electrical rlzsistivity. This suggests that oxygen point defects created by dissolution of cobalt ions in the SnO,
lattice are controlling the densification rate of these ceramics.