Nonlinear Electrical and Dielectric Properties of (Ca, Ta)-Doped TiO2 Varistors

✍ Scribed by Wang, W.Y. ;Zhang, D.F. ;Xu, T. ;Zhou, T. ;Chen, X.L.

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 255 KB
• Volume: 194
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/1521-396x(200211)194:1<118::aid-pssa118>3.0.co;2-t

✦ Synopsis

Ca, Ta)-doped TiO 2 varistors with high nonlinear coefficients were obtained by ceramic sintering process. The nonlinear electrical and dielectric properties of the samples doped with 1.0 mol% Ca and different concentrations of Ta (0.05-2.0 mol%) were investigated. Especially, the effects of Ta dopant on the nonlinear and dielectric properties of the (Ca, Ta)-doped TiO 2 varistors were studied in detail. When the concentration of Ta is 0.5 mol%, the sample possesses the highest nonlinear coefficient (16.6). By analogy to a grain-boundary atomic defect model, the effects of Ta and the nonlinear electrical behavior of the TiO 2 system were explained.