STUDIES OF ELECTRON TUBE MATERIALS AND THERMIONIC EMISSION PROCESSES. Scientific Report No. 7, October 1, 1961-December 31, 1961
The thermionic emission properties of ultra-pure Ni based oxide cathodes in the clean test diode are being investigated. The effects of processing, activation, and life conditions on thermionic emission such as improvement in the cleanliness of the diode system by pre-processing the bulb, stem and supporting elements prior to final assembly of the test diode, dependence of the electrolytic activation process on cathode temperature, anode voltage and anode current, and operation of the test diodes during life both with and without anode voltage are being investigated. The method which was developed for measuring the evaporation of active material from dispenser cathodes is now being extended to the more difficult probIem of measuring sublimation of active material from oxide cathodes. Preliminary results on the evaporation of Ba and/or BaO were obtained for passive and active metaI base oxide systems such as BaO on Pt, BaO on ultra- pure Ni rod (rod 21), BaO on active N4 Ni, BaO on Ta, C-10 triple oxide coating on ultrapure Ni (rod 21), and C-10 on N4 Ni. Two phenomena reported earlier were interpreted. One is the enhancement of emission and uniformity of emission after exposure to a minute oxygen pressure in the hot state of the thin Bacoated poIycrystalline ultra-pure Ni structure. The other is the displaying, by means of thermionic electrons, of domain patterns of selective magnetic surface spins of Ni lattice atoms. (auth)
- Research Organization:
- General Telephone and Electronics Labs., Inc., Bayside, N.Y.
- DOE Contract Number:
- AF19(604)-7286
- NSA Number:
- NSA-16-025544
- OSTI ID:
- 4816669
- Report Number(s):
- AFCRL-62-2; AD-271101
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- United States
- Language:
- English
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