Accession Number : AD0668685

Title :   INVESTIGATION OF STRONTIUM TUNGSTATE MIXED CRYSTAL CATHODES.

Descriptive Note : Final rept. 27 Aug-27 Dec 67,

Corporate Author : ITT INDUSTRIAL LABS FORT WAYNE IND

Personal Author(s) : Byrum,Bernard W. ; Wolfgang,Lozure G. ; Gumnick,J. L.

Report Date : APR 1968

Pagination or Media Count : 50

Abstract : The purpose of the work described is to investigate the formation and characteristics of 'tungstate' mixed crystal cathodes. The objective is the realization of a lower work function in a relatively rugged cathode. Richardson plots and retarding field electron beam techniques were used to evaluate the work function of sample cathodes. The final set of experiments, done in individual tubes, utilized the zero field value of current for the Richardson data where possible. The zero field values were taken from Schottky plots of the I-V data. All cathodes have been made by spraying the mixed materials onto the metallic substrate. Tantalum was abandoned as a substrate due to adherence problems. Tungsten substrates have been used for high temperature processing. P-50 nickel alloy substrates were used to eliminate adherence problems and reduce activation variables to a minimum. (Author)

Descriptors :   (*CATHODES(ELECTRON TUBES), *TUNGSTATES), (*STRONTIUM COMPOUNDS, TUNGSTATES), CRYSTALS, WORK FUNCTIONS, SUBSTRATES, NICKEL, CARBONATES, TANTALUM, TUNGSTEN, BARIUM COMPOUNDS, DEPOSITION, SPRAYS, VIDICONS, COATINGS

Subject Categories : Electrooptical and Optoelectronic Devices
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE