Morphological evolution of pore channels in alumina

Conference · Mon Aug 01 04:00:00 EDT 1988

OSTI ID:6774903

Roedel, J; Glaeser, A M

The morphological evolution of pore channels in sapphire bicrystals during annealing at 1800/degree/C has been studied. The effects of boundary crystallography as well as channel orientation within the boundary plane have been examined by using bicrystals with channels etched into either the (0001) or the (1120) planes, and oriented parallel to the (1100) and (1120) directions for the (0001) plane and parallel to the (1100) and (0001) directions in the (1120) plane. The critical aspect ratio for breakup into multiple pores, the kinetics of breakup, and the apparent surface diffusivity are affected by changes in channel crystallography. These behavioral differences are attributed to surface energy anisotropy effects. 23 refs., 7 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6774903
• Report Number(s): LBL-25147; CONF-8805164-2; ON: DE89000559
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ANISOTROPY
ANNEALING
CHALCOGENIDES
CORUNDUM
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
HEAT TREATMENTS
MICROSTRUCTURE
MINERALS
ORIENTATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POROSITY
SAPPHIRE
SURFACES