The influence of sintering process and atmosphere on the non-ohmic properties of SnO2 based varistor

Authors
Leite, ER Nascimento, AM Bueno, PR Longo, E Varela, JA
Citation
Er. Leite et al., The influence of sintering process and atmosphere on the non-ohmic properties of SnO2 based varistor, J MAT S-M E, 10(4), 1999, pp. 321-327
Citations number
19
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
ISSN journal
09574522 → ACNP
Volume
10
Issue
4
Year of publication
1999
Pages
321 - 327
Database
ISI
SICI code
0957-4522(199906)10:4<321:TIOSPA>2.0.ZU;2-C
Abstract
The non-ohmic properties of the 98.95% SnO2 + 1.0 CoO + 0.05 Nb2O5 (all in mole%) system, as well as the influence of sintering temperature and atmosp here on these properties, were characterized in this study. The maximum non -linear coefficient (alpha = 32) was obtained for a sintering temperature o f 1300 degrees C in an oxygen atmosphere and this maximum is associated wit h the presence of O in SnO2 grain boundaries, as interface defects. Experim ental results also indicate thermionic-type conduction mechanisms, which ar e associated with the potential barrier of Schottky or Poole-Frenkel types.