Increase in upturn power dissipation of surge suppressors due to highly defective nanostructure of zinc oxide

Mahmud, Shahrom, Abdullah, Mat and Putrus, Ghanim (2006) Increase in upturn power dissipation of surge suppressors due to highly defective nanostructure of zinc oxide. Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry, 36 (1). pp. 59-64. ISSN 1553 3174

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Abstract

Nanodefects are probable root causes for the observed high power dissipation of ZnO-based surge suppression devices (SSDs). In this work, nanodefects are introduced by overgrinding ZnO for 100 hours via wet milling. Using FESEM, ZnO nanostructures are found to contain fine cracks, chipped-off surfaces and nanofragments. For the defective ZnO, the zinc relative atomic % (EDS analysis) is observed to be much larger accompanied by higher oxygen vacancy concentration as revealed by PL green emission. Average particle size drops from 0.24 μm to 0.19 μm and specific surface area increases from 4.72m2/g to 5.67m2/g. Fabricated SSDs with defective ZnO exhibits higher power dissipation and bigger grain resistivity. A model is proposed to provide a correlation between nanodefects and power dissipation. Copyright © 2006 Taylor & Francis Group, LLC.

Item Type:	Article
Uncontrolled Keywords:	Nanodefects, power dissipation, surge suppressor, varistor, ZnO
Subjects:	F200 Materials Science H600 Electronic and Electrical Engineering
Department:	Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User:	Becky Skoyles
Date Deposited:	30 Jan 2015 12:03
Last Modified:	12 Oct 2019 19:06
URI:	http://nrl.northumbria.ac.uk/id/eprint/19960

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