MICROWAVE FILTERS AND COUPLING STRUCTURES
Abstract
AD-260 4129 AD-260 413Div. 8, 25U (1 Aug 61) OTS price $1.10 Ohio State U. Research Foundation, Columbus, Ohio. THE MECHANISM OF OXIDE FORMATION IN THE INITIAL STAGES OF OXIDATION. Quarterly rept. no. 4, 1 Apr-30 June 61, by D. W. Rausch, K. L. Moazed, and M. G. Fontana. 14 Apr 61, 3p. (Contract DA 33-019-ORD-3387) Unclassified report DESCRIPTORS: *Tantalum, *Tungsten, *Oxides, *Oxidation, *Field emission, Gases, Gas diffusion, Temperature, High temperature research, Pressure, *Adsorption, Resistance, Measurement, Vacuum apparatus, *Electron tubes, Test methods, Tantalum compounds, Tungsten compounds. Field emission runs were made with W and Ta emitter tips fabricated from 4 to 6-mil-diam commercial grade W and Ta to observe the progress of adsorption of residual gases over a range of pressures and temperatures. Electrolytic polishing was used to produce the fine point required for emission. The tips were cleaned by resistive heating prior to emission. Field-evaporation was also utilized on Ta. The emission patterns of clean Ta and W tips were similar. The progress of adsorption of residual gases on W at elevated temperatures and constant pressure was observed. Work was initiated on the measurement of emitter tip temperature below 800 C by an electrical resistance method. A non-refrigerated, highvacuum, isolation trap was developed and successfully operated in the vacuum system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1961
- Accession Number
- AD0260412
Entities
People
- G.l. Matthaei
- J.t. Billjahn
Organizations
- SRI International