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Influence of process variables on microstructure and V-I characteristics of multicomponent zinc oxide-based nonlinear resistors

Asokan, T and Iyengar, GNK and Nagabhushana, GR (1987) Influence of process variables on microstructure and V-I characteristics of multicomponent zinc oxide-based nonlinear resistors. In: Journal of the American Ceramic Society, 70 (9). pp. 643-650.

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Abstract

Studies were made of the effect of process variables such as calcination, initial particle size, and postsintering on d., microstructure, voltage-current (V-I) characteristics, and energy-handling capability of a ZnO-based composite: 87.325 wt.% ZnO + 0.1% $Nb_2O_5$ + 3.5% $Sb_2O_3$ + 6% $Bi_2O_3$ + 0.55% $CoO$ + 0.7% $MnO_2$+ 0.9% $Cr_2O_3$ + 0.9% $NiO$ + 0.025% $Al(NO_3)_3$. The nonlinear characteristics are improved by the calcination of a $ZnO + Nb_2O_5$ mixt. at 1200\degree for 1 h. The postsintering heat treatment rejuvenates the V-I characteristics of the degraded sample to a great extent. The postsintered sample containing $Nb_2O_5$, prepared by using a calcined charge of particle size around 1 \mum, possesses better V-I characteristics and energy-handling capability compared to the samples prepared without the calcination step.

Item Type: Journal Article
Additional Information: Copyright belongs to American Ceramics Society
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited: 24 Mar 2008
Last Modified: 27 Aug 2008 13:16
URI: http://eprints.iisc.ernet.in/id/eprint/13429

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