Electrophoretic deposition of (Zn, Nb)SnO2-films varistor superficially modified with Cr3+. Issue 7 (July 2015)

• Record Type: Journal Article
• Authors: Lustosa, Glauco Meireles Mascarenhas Morandi; da Costa, João Paulo de Campos; Perazolli, Leinig Antônio; Stojanovic, Biljana D.; Zaghete, Maria Aparecida
• Is Part Of: Journal of the European Ceramic Society. Volume 35:Issue 7(2015:Jul.)
• Page Start: 2083
• Page End: 2089
• Publication Date: 2015-07
• Subjects: SnO2 varistor -- Pechini -- Electrophoretic deposition -- Microwave sintering -- Cr3+ diffusion; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2015.01.022
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Recently, there has been an important rise in the research and development aimed to improve the properties of SnO2 -based varistors. Meanwhile, due to fact that ZnO-based varistors possess better electrical properties compared to SnO2 -based varistors, it is shown that it is needful to add additives to improve their properties. In our study, the SnO2 -powder was prepared by the chemical route (Pechini method) with addition of ZnO (1 mol%) and Nb2 O5 (0.05 mol%). Films were obtained by the electrophoretic deposition of SnO2 -based powder, following by microwave oven sintering. Cr 3+ was deposited by EPD on the films surface and thermal treatment was carried out in a microwave oven. After electrical characterization the films showed nonlinear coefficient over 10, breakdown voltage around 60 V, low leakage current (≈10 −6 A) and resistance over 200 kΩ cm. This indicates the efficiency of the used techniques to prepare varistor films with improved electrical properties after Cr 3+ diffusion.