Masters Theses

Abstract

"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.

Advisor(s)

Lewis, Gordon

Committee Member(s)

Ownby, P. D.
Levenson, L. L., 1928-1998

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Ceramic Engineering

Sponsor(s)

University of Missouri--Rolla. Graduate Center for Materials Research
National Science Foundation (U.S.)

Publisher

University of Missouri--Rolla

Publication Date

1972

Pagination

ix, 99 pages

Rights

© 1972 Larry Alton Addington, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Gases -- Analysis
Ionization of gases
Mass spectrometry

Thesis Number

T 2705

Print OCLC #

6032294

Electronic OCLC #

882926725

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