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Electrophoretic deposition of (Zn, Nb)SnO2-films varistor superficially modified with Cr3+

2015; Elsevier BV; Volume: 35; Issue: 7 Linguagem: Inglês

10.1016/j.jeurceramsoc.2015.01.022

1873-619X

Glauco Meireles Mascarenhas Morandi Lustosa, João Paulo de Campos da Costa, Leinig Antônio Perazolli, B.D. Stojanović, M.A. Zaghete,

Copper-based nanomaterials and applications

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 (≈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 Cr3+ diffusion.