Accession Number : AD0619044

Title :   INVESTIGATION OF ELECTRON BEAM PROCESSING OF ALUMINUM OXIDE AND RELATED MATERIALS.

Descriptive Note : Interim scientific rept.,

Corporate Author : MATERIALS RESEARCH CORP ORANGEBURG N Y

Personal Author(s) : CLASS,W. ; Murray,G. T.

Report Date : 15 JUN 1965

Pagination or Media Count : 49

Abstract : The objective of the contract is the growth of superior quality crystals by a modified electron beam float-zone process. Sapphire host crystals grown by the electron beam float-zone technique were evaluated by etch pit techniques and revealed dislocation counts as low as 1000-10000/sq cm. The etch pit technique further disclosed the absence of substructure. These results compare favorably with flame-fusion crystals which typically exhibit both substructure and dislocation counts of approx. 1,000,000/sq. cm. Doping studies are currently under way to determine the most feasible method of introducing controlled amounts of chromium in the high vacuum environment required by the electron beam process. (Author)

Descriptors :   (*LASERS, MATERIALS), (*SAPPHIRE, CRYSTAL GROWTH), (*CRYSTAL GROWTH, ELECTRON BEAMS), (*ELECTRON BEAMS, CRYSTAL GROWTH), SINGLE CRYSTALS, RUBY, ALUMINUM COMPOUNDS, OXIDES, IMPURITIES, CHROMIUM, ETCHED CRYSTALS, ZONE MELTING, CRYSTAL DEFECTS, HEATERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE