In-situ observations of high temperature surface processes on α-alumina bulk crystals
Wang, Z. L. (Zhong Lin)
MetadataShow full item record
Reflection electron microscopy (REM) was applied to image in-situ the dynamic changes of atomic-height steps on the surfaces of a-alumina bulk crystals heated to high temperatures. Atomic diffusion, desorption and adsorption processes on cleaved a-alumina (012) surfaces were directly observed at temperatures of 1470 to 1670 K. The surface started to show visible structural changes at 1470-1520 K. The main surface process appears to be atomic desorption, which creates large, flat vacancy-type terraces on the surface.