Determination of the α-Ai2O3(0001) Surface Relaxation and Termination by Measurements of Crystal Truncation Rods
- 1 February 1998
- journal article
- research article
- Published by World Scientific Pub Co Pte Ltd in Surface Review and Letters
- Vol. 05 (01) , 321-324
- https://doi.org/10.1142/s0218625x98000591
Abstract
We have investigated the unreconstructed (0001) surface structure of sapphire (α- Al 2 O 3) by grazing incidence X-ray scattering. Modulations along the crystal truncation rods were analyzed in order to determine the chemical nature of the terminating plane, and the structural relaxations of the first few atomic planes below the surfoce. The most likely model yields a single Al layer termination with relaxations of the first four planes of -51%, +16%, -29% and +20% respectively. These results compare well with the most recent theoretical calculations on this surface.Keywords
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