Thermal decomposition and electrical conductivity of oxide cathode emission materials

A. N. H. Al-ajili, A. K. Ray, J. R. Travis, S. N. B. Hodgson, A. P. Baker, C. J. Goodhand

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Thermal decomposition and electrical conductivity of oxide cathode emission materials used for cathode ray tubes (CRTs) have been studied under different heat treatment conditions for commercial sprayed cathode systems based on barium-strontium carbonate precursors. Conversion of the carbonate precursor commenced at temperatures above approximately 700 K in vacuum, evidenced by increases in conductivity, however, the rate of the conversion reaction increased dramatically as the temperature was increased. The corresponding chemical and microstructural changes have also been investigated by thermo-gravimetric analysis (TGA) and scanning electron microscopy (SEM), with multiple decomposition stages identified corresponding to the conversion of the carbonate precursor and separate activation steps associated with the reaction of barium oxide with the Mg and Al activating agents in the nickel cathode substrate.
    Original languageEnglish
    Pages (from-to)489-495
    JournalJournal of Materials Science: Materials in Electronics
    Volume11
    Issue number6
    DOIs
    Publication statusPublished - 1 Aug 2000

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    Oxides
    thermal decomposition
    Carbonates
    carbonates
    Pyrolysis
    Cathodes
    cathodes
    Barium
    conductivity
    electrical resistivity
    oxides
    barium oxides
    cathode ray tubes
    Cathode ray tubes
    Strontium
    Nickel
    strontium
    barium
    Thermogravimetric analysis
    heat treatment

    Cite this

    Al-ajili, A. N. H. ; Ray, A. K. ; Travis, J. R. ; Hodgson, S. N. B. ; Baker, A. P. ; Goodhand, C. J. / Thermal decomposition and electrical conductivity of oxide cathode emission materials. In: Journal of Materials Science: Materials in Electronics. 2000 ; Vol. 11, No. 6. pp. 489-495.
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    abstract = "Thermal decomposition and electrical conductivity of oxide cathode emission materials used for cathode ray tubes (CRTs) have been studied under different heat treatment conditions for commercial sprayed cathode systems based on barium-strontium carbonate precursors. Conversion of the carbonate precursor commenced at temperatures above approximately 700 K in vacuum, evidenced by increases in conductivity, however, the rate of the conversion reaction increased dramatically as the temperature was increased. The corresponding chemical and microstructural changes have also been investigated by thermo-gravimetric analysis (TGA) and scanning electron microscopy (SEM), with multiple decomposition stages identified corresponding to the conversion of the carbonate precursor and separate activation steps associated with the reaction of barium oxide with the Mg and Al activating agents in the nickel cathode substrate.",
    author = "Al-ajili, {A. N. H.} and Ray, {A. K.} and Travis, {J. R.} and Hodgson, {S. N. B.} and Baker, {A. P.} and Goodhand, {C. J.}",
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    Thermal decomposition and electrical conductivity of oxide cathode emission materials. / Al-ajili, A. N. H.; Ray, A. K.; Travis, J. R.; Hodgson, S. N. B.; Baker, A. P.; Goodhand, C. J.

    In: Journal of Materials Science: Materials in Electronics, Vol. 11, No. 6, 01.08.2000, p. 489-495.

    Research output: Contribution to journalArticleResearchpeer-review

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    AU - Al-ajili, A. N. H.

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    AU - Baker, A. P.

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    AB - Thermal decomposition and electrical conductivity of oxide cathode emission materials used for cathode ray tubes (CRTs) have been studied under different heat treatment conditions for commercial sprayed cathode systems based on barium-strontium carbonate precursors. Conversion of the carbonate precursor commenced at temperatures above approximately 700 K in vacuum, evidenced by increases in conductivity, however, the rate of the conversion reaction increased dramatically as the temperature was increased. The corresponding chemical and microstructural changes have also been investigated by thermo-gravimetric analysis (TGA) and scanning electron microscopy (SEM), with multiple decomposition stages identified corresponding to the conversion of the carbonate precursor and separate activation steps associated with the reaction of barium oxide with the Mg and Al activating agents in the nickel cathode substrate.

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