Dielectric breakdown of alumina single crystals

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.

Subjects

dielectric breakdown, optical microscopy, single crystal alumina, insulator, breakdown channel,

DDC Class

620:Engineering and allied operations

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http://doku.b.tu-harburg.de/doku/lic_mit_pod.php

Name

Dielectric_Breakdown_of_Alumina_Single_Crystals_TUBdok_version.pdf

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5.09 MB

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Adobe PDF

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Dielectric breakdown of alumina single crystals