Statistics – Applications
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..552.1165z&link_type=abstract
Space Technology and Applications International Forum - 2001. AIP Conference Proceedings, Volume 552, pp. 1165-1170 (2001).
Statistics
Applications
Thermionic And Filament-Based Sources, Spaceborne And Space Research Instruments, Apparatus, And Components
Scientific paper
A thin film dispenser or micro-dispenser cathode can be generated using standard RF sputtering deposition technology. These films are compositionally modulated structures based on W and a multi-component Ba oxide. Annealing to temperatures from 900 to 1300 K results in Ba reduction, transport and diffusion across the emitter surface. A finite temperature range exists (<1200 K) where a uniform Re coating can be retained at the emitter surface. The metallic coating results in a nearly homogeneous work function based on emission characteristics. These films produce stable emission at higher temperatures (>=1200 K) where the uniform Re coating is lost. Analysis of emission properties yield a work function of 2.2 eV and an apparent emission coefficient of 6 A.cm-2.K-2 after annealing to 1200 K. This high apparent emission coefficient yields a film suitable for milliwatt power generation applications. Microminiature Thermionic Converters (MTCs) are one potential application for these films. .
King Daniel B.
Ruffner J. A.
Zavadil Kevin R.
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