Chapter 52. Densification and Defect Chemistry Related to the Varistor Performance of ZnO-Based Ceramics
- John B. Wachtman Jr.
Published Online: 28 MAR 2008
Copyright © 1994 The American Ceramic Society
Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5
How to Cite
Nobrega, M. C. S. and West, J. K. (1994) Densification and Defect Chemistry Related to the Varistor Performance of ZnO-Based Ceramics, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314555.ch52
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375334
Online ISBN: 9780470314555
- nonlinear voltage-current;
- znO-based ceramics;
- intrinsic defect concentrations;
- znO grain-boundary
Studies dealing with nonlinear voltage-current characteristics versus densification and defect chemistry in ZnO-based ceramics may elucidate structure-properties related aspects still not clearly understood on the functionality of these materials. In this paper, evaluation of both densification and intrinsic defect concentrations at the ZnO grain-boundary are used to understand the nonlinearity performance of ZnO ceramics. On the basis of defect chemistry equations for ZnO, the intrinsic concentration of the defects, namely zinc and oxygen vacancies, related to sintering conditions was calculated. The nonlinearity was found to be enhanced when densification was maximized and when the oxygen-rich atmosphere also increased the acceptor concentration.