Sol-gel processing of varistor powders


A new sol-gel method for the preparation of ZnO varistor powders, using inexpensive source materials such as acetates and nitrates, is described. It yields powders with a more homogeneous distribution of dopants compared to the commercially used mixed oxide technique. Varistor ceramics made from sol-gel powders can be sintered at lower temperatures and show improved electrical behavior. This is a consequence of formation of more varistor-active grain boundaries within the ceramics.

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Correspondence to Gert Hohenberger.

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Hohenberger, G., Tomandl, G. Sol-gel processing of varistor powders. Journal of Materials Research 7, 54 (1992).

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