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Issue 33, 2008
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High performance ZnO varistors prepared from nanocrystalline precursors for miniaturised electronic devices

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Abstract

An industrially viable solution-based processing route using minimal amounts of solvent has been used to prepare bulk quantity nanopowders (average particle size 15 ± 3 nm) for the fabrication of ZnO varistors. The xerogels, calcined powders and sintered materials were fully characterised. The preparation of varistors from nanopowders has been optimised by studying the effect of temperature on grain growth, densification and breakdown voltage. The varistors are prepared by sintering at 1050 °C for 2 hours, a temperature that is significantly lower than that used in the current industrial process. Highly dense varistor discs prepared from the sintered material produce devices, with a breakdown voltage 85% higher than that of commercial varistors, making them suitable for use in miniaturised electronic circuitry. Improved performance of these materials has been attributed to the small grain size and better dispersion of additives on ZnO grains.

Graphical abstract: High performance ZnO varistors prepared from nanocrystalline precursors for miniaturised electronic devices

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Publication details

The article was received on 20 Mar 2008, accepted on 30 May 2008 and first published on 08 Jul 2008


Article type: Paper
DOI: 10.1039/B804793F
J. Mater. Chem., 2008,18, 3926-3932

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    High performance ZnO varistors prepared from nanocrystalline precursors for miniaturised electronic devices

    S. C. Pillai, J. M. Kelly, D. E. McCormack and R. Ramesh, J. Mater. Chem., 2008, 18, 3926
    DOI: 10.1039/B804793F

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