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Published in: Journal of Materials Science: Materials in Electronics 6/2010

01-06-2010

Influence of Nb addition on microstructure, electrical, dielectric properties, and aging behavior of MnCoDy modified Zn–V-based varistors

Author: Choon-Woo Nahm

Published in: Journal of Materials Science: Materials in Electronics | Issue 6/2010

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Abstract

The microstructure, electrical properties, dielectric characteristics, and DC accelerated aging behavior of the MnCoDy modified Zn–V-based varistors were investigated for Nb amount of 0.0–0.25 mol% by sintering at 900 °C. The microstructure of the MnCoDy modified Zn–V-based varistors consisted of ZnO grain as a main phase and Zn3(VO4)2, ZnV2O4, and DyVO4 as the secondary phases. The Nb addition led to the increase of grain size, whereas it does not have an effect on the sintered density. The nonlinear coefficient improved with the increase of Nb amount up to 0.1 mol%, whereas the further Nb additions impaired it. A maximum of the nonlinear coefficient (35) was obtained at 0.1 mol% Nb. The Nb acted as a donor less than 0.1 mol% and an acceptor more than 0.25 mol%. The best stability of system against DC accelerated aging stress was obtained at 0.1 mol% Nb, in which %ΔE1 mA = −0.24%, %Δα = −15.4%, %Δ ε′APP = −1.4%, and %Δ tanδ = +12.5% for stress state of 0.85 E1 mA/85 °C/24 h.

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go back to reference M.F. Yan, A.H. Heuer, in Additives and Interfaces in Electronic Ceramics (American Ceramic Society, Columbus, OH, 1983), p. 71 M.F. Yan, A.H. Heuer, in Additives and Interfaces in Electronic Ceramics (American Ceramic Society, Columbus, OH, 1983), p. 71
Metadata
Title
Influence of Nb addition on microstructure, electrical, dielectric properties, and aging behavior of MnCoDy modified Zn–V-based varistors
Author
Choon-Woo Nahm
Publication date
01-06-2010
Publisher
Springer US
Published in
Journal of Materials Science: Materials in Electronics / Issue 6/2010
Print ISSN: 0957-4522
Electronic ISSN: 1573-482X
DOI
https://doi.org/10.1007/s10854-009-9954-8

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