RESEARCH ON THE PRODUCTION AND PHYSICS OF SINGLE CRYSTAL EMITTERS
NOTRE DAME UNIV IN
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Single crystals of tungsten and molybdenum from 1-10 cm long were produced by the Robison-plus-torsion technique in 4-5 mil filaments. These were studied in an improved electron projection diode, in which point-bypoint and average thermionic constants could be measured on the same filament. The work functions for various directions of single crystal molybdenum were found to be the same as those for single crystal tungsten. Also the average values of work function phi sub R and A sub R were 4.40 and 40 respectively, for both tungsten and molybdenum. Thermal treatment always developed facets on the crystal areas of high work function. These facets had highest thermal stability when a shingled structure developed on them during heating.
- Inorganic Chemistry
- Metallurgy and Metallography