Artículos de revistas
The influence of yttrium on a typical SnO2 varistor system: Microstructural and electrical features
Fecha
2005-05-10Registro en:
Parra, Rodrigo; Maniette, Y.; Varela, J. A.; Castro, Miriam Susana; The influence of yttrium on a typical SnO2 varistor system: Microstructural and electrical features; Elsevier; Materials Chemistry and Physics; 94; 2-3; 10-5-2005; 347-352
0254-0584
CONICET Digital
CONICET
Autor
Parra, Rodrigo
Maniette, Y.
Varela, J. A.
Castro, Miriam Susana
Resumen
The influence of yttrium oxide, Y2O3, on the microstructure development of the SnO2·Co3O4·Nb2O5 typical varistor system was studied with scanning (SEM) and transmission (TEM) electron microscopies. The different phases present in the studied samples were characterized through XRD, EDS and selected area diffraction patterns (SAD). Particles of Co2SnO4 were observed with TEM in every sample, whereas clusters of the pyrochlore phaseY2Sn2O7 were observed with SEM in samples with 0.05, 0.10 and 0.25 mol% ofY2O3. The higher non-linearity (α = 16) was achieved with the addition of 0.05 mol% of Y2O3. The influence of the secondary phases on the electrical properties is also addressed in this work.