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Title: Dielectric breakdown of alumina single crystals
Language: English
Authors: Neusel, Claudia 
Jelitto, Hans 
Schmidt, Dieter 
Janßen, Rolf 
Felten, Frank 
Schneider, Gerold A. 
Keywords: Aluminiumoxid Einkristall, Isolator, Durchschlagskanal, bruchmechanische Analyse;dielectric breakdown, optical microscopy, single crystal alumina, insulator, breakdown channel,
Issue Date: 2011
Source: Journal of the European Ceramic Society, Volume 32, Issue 5, May 2012, Pages 1053-1057
Abstract (english): The bulk breakdown behaviour of alumina single crystals with two different crystal orientations, {11-20}-plane (single crystal A) and {0001}-plane (single crystal C), have been studied. Therefor plan-parallel single crystal samples were electrically loaded until dielectric breakdown was achieved. For each crystal orientation, a characteristic breakdown channel direction through the sample could be defined. In C-oriented crystals the breakdown channel originated parallel to the c-axis. For A-oriented crystals however, the breakdown channel crossed the sample in an oblique direction; the angle between crystal surface and breakdown channel was 60°. Here, the breakdown channel crossed the sample along an A-plane. Although the breakdown channel paths of A and C crystals are different, the observed breakdown strength are identical within the scatter range.
DOI: 10.15480/882.1142
Institute: Keramische Hochleistungswerkstoffe M-9 
Type: ResearchPaper
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