Accession Number:

AD0253675

Title:

STUDIES ON BASE NICKELS FOR OXIDE-COATED CATHODES

Descriptive Note:

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS ELECTRON TUBE RESEARCH LAB

Personal Author(s):

Report Date:

1960-10-15

Pagination or Media Count:

1.0

Abstract:

Studies of the relationship between chemical reduction and thermionic activity of an oxide cathode continued. A method is described whereby the degree of diffusion throttling produced in a given case can be determined by a resistance measurement, using the analogue between steady-state diffusion processes and electro-dynamic processes. Further studies utilizing the application and removal of carbon from the back face of the cathode base, in a separate vacuum enclosure, are also described. Cathodes, based on 0.2 and 0.08 Al-Ni alloys, have now been operated at 1093 K for about 15,000 hours. Results are reported on the activation of oxide cathodes through exposure to heated Ti anodes. Hydrogen evolved from the Ti anodes causes an enhancement of emission from an oxide cathode which was exposed to the anode. The technique used to prepare BaO thin film cathodes is described. Photoelectron yield measurements on a BaO coating produced by conversion of BaCO3 have been inaugurated. Preliminary results show a rapid enhancement of the photoelectron yield as a consequence of the monochromatic light incident on the coating. Results are presented on the deactivation of an oxide-coating cathode by exposure to Cl dissociated from BaCl2 by electron bombardment. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE