Effect of Crystal Orientation on Conductivity and Electron Mobility in Single‐Crystal Alumina
- 1 October 1992
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 75 (10) , 2790-2794
- https://doi.org/10.1111/j.1151-2916.1992.tb05506.x
Abstract
The electrical conductivity of high‐purity, single‐crystal alumina is determined parallel to and perpendicular to the c‐axis. The mean conductivity of four samples of each orientation is a factor 3.3 higher parallel to the c‐axis than perpendicular to it. The conductivity as a function of temperature is attributed to extrinsic electron conduction at temperatures from 400° to 900°C and intrinsic semiconduction at temperatures from 900° to 1300°C. In the high‐temperature regime, the slope on all eight specimens is 4.7 ± 0.1 eV. Hence, the thermal bandgap at 0 K is 9.4 ± 0.2 eV.Keywords
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