Paper Title:
Influences of Twin Boundaries on Microstructural Characteristics of ZnO Varistors Simulated by Voronoi Network
  Abstract

The presence of twins in ZnO varistors raises interesting questions concerning the potential role of those electrically distinctive twin boundaries in the characteristics of ZnO varistors. The paper uses Voronoi networks to simulate the microstructures of ZnO varistors. The relation between the relative standard deviation of grain size and the ratio of twin number to grain number is obtained. It indicates that the relative standard deviation decreases with the increasing of the twin ratio. On the other hand, ZnO varistor samples with different content of Al2O3 additive were prepared to gain different twin ratios. The simulation has the same conclusion as that obtained from experiments. The probable mechanism of ZnO grain growth inhibition by twins is that the twins increase the mobility viscosity of ZnO grains and grain boundaries, and drag ZnO grains and liquid grain boundaries during the sintering course, then the grain growth is inhibited, and the microstructure becomes more uniform.

  Info
Periodical
Key Engineering Materials (Volumes 368-372)
Edited by
Wei Pan and Jianghong Gong
Pages
490-492
DOI
10.4028/www.scientific.net/KEM.368-372.490
Citation
J. L. He, J. Hu, F. C. Luo, "Influences of Twin Boundaries on Microstructural Characteristics of ZnO Varistors Simulated by Voronoi Network", Key Engineering Materials, Vols. 368-372, pp. 490-492, 2008
Online since
February 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Cheng Ju Zhang, Jin Feng Wang, Wen Bin Su, Guo Zhong Zang, Hong Cun Chen
Abstract:The effects of Pr on the microstructure and nonlinear electrical properties of the (Co,Ta)-doped SnO2 varistors were investigated. It was...
275
Authors: Yoshiaki Kinemuchi, Hisashi Kaga, Satoshi Tanaka, Keizo Uematsu, Hiromi Nakano, Koji Watari
Abstract:Thermoelectric properties of zinc oxide ceramics are largely influenced by the mobility variation because of the formation of double...
581
Authors: Dan Liu, Yong Ke Yan, He Ping Zhou
Abstract:<001> textured 0.675Pb(Mg1/3Nb2/3)O3-0.325PbTiO3 (PMN-32.5PT) ceramics were prepared by templated grain growth with micron scale BaTiO3...
15
Authors: Adriana Scoton Antonio Chinelatto, Milena Kowalczuk Manosso, Elíria Maria Jesus Agnollon Pallone, Ana Maria Souza, Adilson Luiz Chinelatto
Abstract:Sintering in two-steps has been applied with success for densification of nanometric and submicrometer ceramic powders without grain growth....
221
Authors: Kean Pah Lim, Kuen Hou Cheong, Abdul Halim Shaari, Mansor Hashim, Albert Han Ming Gan, Hui Wei Chin, Siau Wei Ng
Chapter 5: Manganite and Magnetic Materials
Abstract:In this paper, nanosized La0.85Na0.15MnO3 (LNMO) has been synthesized via sol-gel method by involving two...
261