"Simple diodes were constructed utilizing oxide cathodes and nickel anodes. The cathodes were obtained by applying a mixture of barium, strontium, and calcium carbonates to a nickel filament and decomposing them to yield the oxides. The products of decomposition were analyzed by monitoring the composition of the background gases in the vacuum chamber. A portion of the flux of positive ions bombarding the cathode during diode operation was analyzed. It was possible to determine the region of origin of the ions and their potential energy at the time of formation. Positive ions of chlorine, fluorine, sodium, potassium, and rubidium were released at the anode surface when an emission current was drawn. The relative heights of the peaks due to ions created in the interelectrode space were very sensitive to processes occurring in the diode region. Changes in the shape of the peaks due to ions created in the interelectrode space were related to changes in the activity of the cathode and the amount of space charge surrounding the cathode. The transport of BaO was observed in the mass spectra taken at a cathode temperature of 1370ºC. Nondispersive x-ray analysis of the anode facing the cathode operated at 1370ºC revealed the presence of barium and strontium"--Abstract, page ii.
Ownby, P. D.
Levenson, L. L., 1928-1998
Materials Science and Engineering
M.S. in Ceramic Engineering
University of Missouri--Rolla. Graduate Center for Materials Research
National Science Foundation (U.S.)
University of Missouri--Rolla
ix, 99 pages
© 1972 Larry Alton Addington, All rights reserved.
Thesis - Open Access
Gases -- Analysis
Ionization of gases
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Addington, Larry A., "A mass spectrometric characterization of positive ions created in simple vacuum diodes incorporating oxide cathodes with supplementary analysis of background gases" (1972). Masters Theses. 5325.