ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The presence of twins in ZnO varistors raises interesting questions concerning the potentialrole of those electrically distinctive twin boundaries in the characteristics of ZnO varistors. The paperuses Voronoi networks to simulate the microstructures of ZnO varistors. The relation between the relativestandard deviation of grain size and the ratio of twin number to grain number is obtained. It indicates thatthe relative standard deviation decreases with the increasing of the twin ratio. On the other hand, ZnOvaristor samples with different content of Al2O3 additive were prepared to gain different twin ratios. Thesimulation has the same conclusion as that obtained from experiments. The probable mechanism of ZnOgrain growth inhibition by twins is that the twins increase the mobility viscosity of ZnO grains and grainboundaries, and drag ZnO grains and liquid grain boundaries during the sintering course, then the graingrowth is inhibited, and the microstructure becomes more uniform
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.490.pdf
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