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Influence of Process Variables on Microstructure and V‐I Characteristics of Multicomponent ZnO‐Based Nonlinear Resistors
Author(s) -
ASOKAN T.,
IYENGAR G. N. K.,
NAGABHUSHANA G. R.
Publication year - 1987
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1987.tb05733.x
Subject(s) - calcination , microstructure , materials science , particle size , composite number , non blocking i/o , grain size , chemical engineering , metallurgy , mineralogy , analytical chemistry (journal) , composite material , chemistry , chromatography , catalysis , biochemistry , engineering
Studies have been made of the effect of process variables such as calcination, initial particle size, and postsinterin on density, microstructure, V‐I characteri stics, and energy ‐handling capability of a ZnO‐based composite: 87.325 wt% ZuO + 0.1% Nb 2 O 5 + 3.5% Sb 2 O 5 + 6% Bi 2 O 3 + 0.55% CoO + 0.7% MnO 2 + 0.9% Cr 2 O 3 + 0.9% NiO + 0.025% Al(NO 3 ) 3 . The nonlinear characteristics were found to be improved by the calcination of a ZnO + Nb 2 O 5 mixture at 1200°C for 1h. The postsintering heat treatment was found to rejuvenate V‐I characteristics of the degraded sample to a greater extent. Further, the postsintered sample containing Nb 2 O 5 , prepared by using a calcined charge of particle size around 1 μm, was found to possess better V‐I characteristics and energy‐handling capability compared to the samples prepared without the calcination step.