Journal ArticleDOI
Electrical Properties of ZnO‐Bi2O3 Ceramics
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TLDR
In this paper, the nonlinear volt-ampere characteristics and small-signal ac capacitance and resistance of sintered ZnO containing 0.5 mol% Bi2O3 were measured.Abstract:
The nonlinear volt-ampere characteristics and small-signal ac capacitance and resistance of sintered ZnO containing 0.5 mol% Bi2O3 were measured. Many of the electrical properties are related directly to the microstructure, which consists of conductive ZnO grains separated by a continuous amorphous Bl2O3, phase. The origin of the nonlinear conduction in the intergranular phase was confirmed by experiments with evaporated thin films. The proposed conduction mechanism in varistors containing ZnO and Bi2O3 is a combination of hopping and tunneling in the amorphous phase.read more
Citations
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Journal ArticleDOI
Application of Zinc Oxide Varistors
TL;DR: In this paper, the application of ZnO varistors has been treated in a systematic way in the literature and a detailed description of these parameters and their relation to microstructure and the processing of the varistor is provided.
Journal ArticleDOI
Theory of conduction in ZnO varistors
TL;DR: In this article, a theory was presented which quantitatively accounts for the important features of conduction in ZnO-based metaloxide varistors, which predicts a varistor breakdown voltage of 3.2 V/grain boundary for n0=1017 carriers' cm−3 and T=300 K.
Journal ArticleDOI
The physics of metal oxide varistors
Lionel M. Levinson,H. R. Philipp +1 more
TL;DR: In this paper, the authors present an understanding of the conduction mechanisms and physical processes relevant to the performance of ZnO-based ceramic varistors and show that the qualitative features of highly nonlinear conductivity are largely independent of the details of varistor composition or processing but rather appear to be a general effect engendered by a microstructure of conducting grains surrounded by thin insulating oxide barriers.
Journal ArticleDOI
Capacitance‐vs‐voltage characteristics of ZnO varistors
TL;DR: In this paper, the capacitance-vs-voltage characteristics of ZnO varistors which contain rare earth metal oxides and cobalt oxide were studied on the basis of the symmetrical Schottky-barrier model of the grain boundary region.
Journal ArticleDOI
Grain Growth in Sintered ZnO and ZnO-Bi2O3 Ceramics
Tetsuya Senda,Richard C. Bradt +1 more
TL;DR: Grain growth in high-purity ZnO with Bi2O3 additions from 0.5 to 4 wt% was studied for sintering from 900° to 1400°C in air.
References
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On the Dispersion of Resistivity and Dielectric Constant of Some Semiconductors at Audiofrequencies
TL;DR: In this paper, the ac resistivity and the apparent dielectric constant of the material show a dispersion which can be explained satisfactorily with the help of a simple model of the solid: there should be wellconducting grains separated by layers of lower conductivity.
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Electronic properties of amorphous dielectric films
TL;DR: In this paper, the effect of the amorphous and glassy structure of most dielectric films on their electrical characteristics is discussed with reference to experimental results obtained, in particular, with ammorphous germanium.
Book ChapterDOI
Electronic Processes in Zinc Oxide
TL;DR: In this paper, the electronic processes in zinc oxide are discussed, and the applications which depend in a direct way on the electronic process in ZnO are discussed in detail, including its use as a catalyst and as photocatalyst for a series of chemical reactions.
Journal ArticleDOI
Polymorphism of Bismuth Sesquioxide. II. Effect of Oxide Additions on the Polymorphism of Bi2O3.
Ernest M. Levin,Robert S. Roth +1 more
TL;DR: Only the monoclinic and the cubic forms of Bi2O3 were found to be stable, and other phases, frequently reported by previous investigators, such as tetragonal and body-centered cubic (b. c.c.c.), were shown to form metastably from cooled liquid or cubic.
Journal ArticleDOI
Sintering of ZnO: I, Densification and Grain Growth
T. K. Gupta,Robert L. Coble +1 more
TL;DR: In this article, the densification and grain growth rate of pure MgO powder compacts are measured between 1450 and 1650°C in air and applied to the lattice diffusion model to calculate diffusion coefficients in fair agreement with the directly measured diffusion coefficients for magnesium.