Abstract
During the activation and ageing, the evaporation components and rates from 4.56: 1.44: 2 impregnated dispenser cathode have been determined by the vapor-collect method based on the Auger electron spectroscopy (AES). (1) The evaporation rate of a cathode after ageing differs from that of a just activated cathode by a factor of 5 to 10. The evaporation energy of the former is 4.58 eV, and that of the latter is 4.34eV. (2) At operating temperature, the metallic barium in the evaporated materials is about 90%, and the barium oxide is about 9.3%. (3) Blow 1000°C the evaporation of Ca is not significant; over 1150°C the Ca starts evaporating rapidly, particularly in the activation process, it may approach 3.5% at 1250°C.
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Youngkang, Z., Qingyuan, Z. & Yiying, Z. Research on the evaporation property of impregnated dispenser cathode by AES. J. of Electron.(China) 5, 125–132 (1988). https://doi.org/10.1007/BF02778817
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DOI: https://doi.org/10.1007/BF02778817