Other
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..387..337z&link_type=abstract
Space technology and applications international forum (STAIF - 97). AIP Conference Proceedings, Volume 387, pp. 337-344 (1997).
Other
Magnetohydrodynamic Generators And Thermionic Convertors, Plasma Diodes, Structure Of Clean Surfaces, Surface And Interface Dynamics And Vibrations, Near-Field Scanning Optical Microscopes, X-Ray, Mossbauer, And Other Gamma-Ray Spectroscopic Analysis Methods
Scientific paper
The morphology of alumina and scandia ceramics exposed to controlled vacuum and diffusion modes in a thermionic converter has been studied. Evidence for vaporization at a temperature of 1770 K is manifest in the resulting surface morphologies of both ceramics, consistent with reported sample mass loss. Alumina shows intergranular relief with the formation of terrace-step structure on the grain surfaces. Terrace formation is not directly observed on scandia, however the development of vertical structure and maintenance of voids indicates that vaporization is initiated by structure at the grain edges. Extensive Sc2O3 re-deposition occurs on the scandia surface, possibly mediated by the presence of molybdenum and tungsten. Evidence exists for refractory metal secondary phase formation in this deposit in the form of Sc6MO12 (M=W or Mo). Alumina also shows evidence for materials' interactions in the form of tantalum assisted vaporization which significantly alters the terrace structure.
Klinkov Alexander E.
Olson David L.
Zavadil Kevin R.
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