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- Title
An AFM/EFM Study of the Grain Boundary in ZnO-Based Varistor Materials.
- Authors
Gheno, Simoni M.; Kiminami, Ruth H. G. A.; Morelli, Márcio M.; Bellini, Jusmar V.; Paulin Filho, Pedro I.
- Abstract
Zinc oxide (ZnO)-based varistors are metal oxide varistors whose nonlinear properties are characterized by electrical resistance that decreases as the applied field increases. The multiphasic nature of varistors leads to the formation of Schottky barriers, which are responsible for the materials' nonlinear behavior. The objective of this work was to image the potential barriers in ZnO doped with 0.5 mol% Cu and x wt% G (G is a frit and x=0, 1, and 5 wt%). The frit served to form a glassy insulating layer around the grain boundaries. Samples were sintered at 1050°C and the microstructures were analyzed using a Nanoscope IIIa atomic force microscope. The results of the electric force microscopy experiments map the electric field distribution on the surface of CuO–ZnO-based ceramics.
- Subjects
CRYSTAL grain boundaries; ZINC oxide; VARISTORS; ELECTRIC fields; SINTERING; CERAMICS; SCHOTTKY barrier diodes; MICROSTRUCTURE; COPPER oxide
- Publication
Journal of the American Ceramic Society, 2008, Vol 91, Issue 11, p3593
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2008.02704.x