Artículo
The role of the oxygen vacancies on the microstructure development and on the electrical properties of SnO2-based varistors
Fecha de publicación:
31/07/2004
Editorial:
Springer
Revista:
Journal Of Electroceramics
ISSN:
1385-3449
e-ISSN:
1573-8663
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Variations on the microstructure development and on the electrical properties of SnO2-based varistors are discussed on the basis of the oxygen vacancies created or annihilated by the presence of different additives. Electron paramagnetic resonance (EPR) analysis of sintered samples evidenced a substantial increase in the paramagnetic oxygen vacancies concentration when Nb2O5 is added to the SnO2 · Co3O4 system. On the other hand, the observed diminution in the concentration of such species after the addition of Fe2O3 indicates solid solution formation. The quantification of paramagnetic oxygen vacancies allowed to confirm the proposed substitutions taking place in the lattice during sintering. These findings are supported by scanning electron microscopy, by density measurements and by current density versus electric field curves. The characterization of secondary phases through EDS assisted SEM and TEM is also reported in this work.
Palabras clave:
Defects
,
Electrical Properties
,
Microsdtructure
,
Varistors
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Identificadores
Colecciones
Articulos(INTEMA)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Citación
Parra, Rodrigo; Aldao, Celso Manuel; Varela, J. A.; Castro, Miriam Susana; The role of the oxygen vacancies on the microstructure development and on the electrical properties of SnO2-based varistors; Springer; Journal Of Electroceramics; 14; 2; 31-7-2004; 149-156
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