Electrophoretic deposition of (Zn, Nb)SnO2-films varistor superficially modified with Cr3+
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Data
2015-07-01
Autores
Mascarenhas Morandi Lustosa, Glauco Meireles [UNESP]
Campos da Costa, Joao Paulo de
Perazolli, Leinig Antonio [UNESP]
Stojanovic, Biljana D.
Zaghete, Maria Aparecida [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
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 Nb2O5 (0.05 mol%). Films were obtained by the electrophoretic deposition of SnO2-based powder, following by microwave oven sintering. Cr3+ 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 (approximate to 10(-6) A) and resistance over 200 kg cm. This indicates the efficiency of the used techniques to prepare varistor films with improved electrical properties after Cr3+ diffusion. (C) 2015 Elsevier Ltd. All rights reserved.
Descrição
Palavras-chave
SnO2 varistor, Pechini, Electrophoretic deposition, Microwave sintering, Cr3+ diffusion
Como citar
Journal Of The European Ceramic Society, v. 35, n. 7, p. 2083-2089, 2015.