INVESTIGADORES
PARRA Rodrigo
artículos
Título:
Electrical and microstructural properties of (Zn, Nb, Fe)-doped SnO2 varistor systems
Autor/es:
R. PARRA; J. A. VARELA; C. M. ALDAO; M. S. CASTRO
Revista:
CERAMICS INTERNATIONAL
Editorial:
Elsevier Science Ltd.
Referencias:
Año: 2005 vol. 31 p. 737 - 742
ISSN:
0272-8842
Resumen:
The electrical and microstructural properties of SnO2-based varistors with the addition of 0.025 and 0.050 mol% of Fe2O3 have been characterised. Electric field (E) versus current density (J) curves showed that the effect of Fe2O3 addition is to increase both the non-linear coefficient and the breakdown voltage. Variations in the potential barrier height were inferred from impedance spectroscopy (IS) analysis. Through transmission electron microscopy (TEM), the presence of precipitates of secondary phases was confirmed. Samples with precipitates displayed poor electrical properties.
