Abstract
The dc electrical strength of sapphire and poly crystalline alumina was studied up to 1400°C. The electrical strength was essentially identical for both materials. It was > 106 V/cm at room temperature and decreased gradually with temperature up to 900°C (2.6×105 V/ cm), then dropped rapidly to 2×104 V/cm at 1400°C for a sample thickness of ∼ 100 μm. The electrical strength decreased with the sample thickness. It was inversely proportional to the thickness for samples thicker than ∼ 600 μm at 1200°C. The breakdown behavior was explained on the basis of a thermal breakdown model.
Original language | English |
---|---|
Pages (from-to) | 404-410 |
Number of pages | 7 |
Journal | Journal of the American Ceramic Society |
Volume | 64 |
Issue number | 7 |
DOIs | |
Publication status | Published - 1981 Jul |
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry