INTEMA 05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
The influence of Aluminium on the Overall Properties of SnO2-based varistors
Autor/es:
R PARRA,; Y MANIETTE,; VARELA, JA; M.S. CASTRO
Revista:
JOURNAL OF MATERIALS SCIENCE
Editorial:
Springer
Referencias:
Año: 2007 vol. 42 p. 4832 - 4837
ISSN:
0022-2461
Resumen:
The influence of aluminium on the development of the microstructure and on the electrical behaviour of the SnO2.Co3O4.Nb2O5 typical varistor system was studied. Two sources of Al were used, alumina (Al2O3) and boehmite (AlO(OH)). The microstructural features were characterised with scanning (SEM) and transmission (TEM) electron microscopies. The different phases present in the studied samples were also studied with XRD, EDS and electron diffraction patterns of selected areas (SAED). Particles containing Sn, Co, Al, and O were unveiled with TEM. Impedance spectroscopy measurements and current density vs. electric field characteristics revealed superior electrical properties for samples with AlO(OH). The higher non-linearity (alpha= 19) was achieved with the addition of 0.1 % mol of boehmite. The influence of the secondary phases on the electrical properties is also addressed in this work.
