Issue 10, 2003
From the journal:

Journal of Materials Chemistry

The effect of processing conditions on varistors prepared from nanocrystalline ZnO†

Suresh C. Pillai,a   John M. Kelly,*a   Declan E. McCormack,*b   Paul O'Brienc  and  Raghavendra Rameshd  

* Corresponding authors

a Department of Chemistry, University of Dublin, Trinity College, Republic of Ireland
E-mail: jmkelly@tcd.ie
Fax: 353-1-6712826
Tel: 353-1-6081947

b School of Chemistry, Dublin Institute of Technology, Kevin Street, Republic of Ireland
E-mail: declan.mccormack@dit.ie
Fax: 353-1-4024989
Tel: 353-1-4024778

c The University of Manchester, Department of Chemistry and the Materials Science Centre, Oxford Road, Manchester, UK

d Littelfuse Ireland Ltd., Ecco Road, Dundalk, Republic of Ireland

Abstract

Nanoparticles of ZnO were prepared by the reaction of ethanolic solutions of zinc acetate and oxalic acid followed by drying (80 °C) and calcination (500 °C). Subsequently varistor materials were fabricated from this nanoparticular ZnO via two separate routes:- a) from a “core shell” material using metal salts as additives; b) by using a conventional solid state mixing of metal oxides. Sintering (1050 °C) and subsequent electrical studies were carried out for each of these samples and they were compared with commercial varistor samples prepared under similar conditions. “Core shell” type varistor material showed considerably higher breakdown voltage (Vc = 850 ± 30 V mm−1) as compared to a sample prepared by mixing with metal oxides (Vc = 683 ± 30 V mm−1) or commercial varistor discs (Vc = 507 ± 30 V mm−1). The high breakdown voltage obtained is attributed to the formation of more varistor-active grain boundaries per unit area.

Graphical abstract: The effect of processing conditions on varistors prepared from nanocrystalline ZnO

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Article information

DOI
https://doi.org/10.1039/B306280E
Article type
Paper
Submitted
04 Jun 2003
Accepted
25 Jul 2003
First published
12 Aug 2003

J. Mater. Chem., 2003,13, 2586-2590

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The effect of processing conditions on varistors prepared from nanocrystalline ZnO

S. C. Pillai, J. M. Kelly, D. E. McCormack, P. O'Brien and R. Ramesh, J. Mater. Chem., 2003, 13, 2586 DOI: 10.1039/B306280E

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