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Microstructure control to reduce leakage current of medium and high voltage ceramic varistors based on doped ZnO

Izoulet, Antoine and Guillemet-Fritsch, Sophie and Estournès, Claude and Morel, Jonathan Microstructure control to reduce leakage current of medium and high voltage ceramic varistors based on doped ZnO. (2014) Journal of the European Ceramic Society, 34 (15). 3707-3714. ISSN 0955-2219

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Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2014.05.033

Abstract

The leakage current and the non-linearity coefficient (α) are crucial parameters in varistors. This work, deals with the optimization of the electrical characteristics of medium and high voltage varistors based on the ZnO–Bi2O3–Sb2O3 system. First, the aim was to allow the formation and the stabilization of the spinel phase by reducing the heating rate. To do so, the right sintering temperature and dwell time have to be chosen to obtain a breakdown field suitable for industrial requirements. During cooling, the spinel phase can return to a pyrochlore phase, which contributes to the increase of leakage current. In a second part, this reaction was prevented by faster cooling in an appropriate temperature range. The fine-tuning of both the heating and cooling phases leads to a significant decrease of the leakage current. Moreover, the value of the non-linearity coefficient was increased by 80%, due to better and more homogeneous wetting of the ZnO grains by the Bi-rich phase.

Item Type:Article
HAL Id:hal-01135520
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > TRIDELTA (GERMANY)
Laboratory name:
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Deposited By: cirimat webmestre
Deposited On:25 Mar 2015 13:45

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