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Verhandlungen pp 484-487 | Cite as

A study of an oxide-coated cathode with the electron microscope

  • E. Sugata
  • S. Nakamura

Abstract

The relation between the thermionic electron emission and the surface structure or crystallite size of the oxide cathode material is a problem of interest for physicists as well as for engineers. Oxide cathodes, however, are extremely unstable in the atmosphere, whereas only a mean size is measured in vacuum by the X-ray diffraction method, as used by Eisenstein (1), Rooksby (2), Wright (3) and Yamaka (4). Recently, in Japan, Yazawa and Yako (5) and Hirota (6) have investigated a replica method which can fix the state of the cathode surface in vacuum. On the other hand, oxide cathodes during decomposition were directly observed in the electron microscope with a special specimen-chamber by Ueda (7).

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References

  1. 1.
    EISENSTEIN, A.: J. appl. Physics 17, 434 and 654 (1946).Google Scholar
  2. 2.
    ROOKSBY, R. R.: Brit. J. appl. Physics 6, 272 (1955).ADSCrossRefGoogle Scholar
  3. 3.
    WRIGHT, D. A.: Le Vide 9, 58 (1954).Google Scholar
  4. 4.
    YAMAHA, E.: J. appl. Physics 23, 937 (1952).ADSCrossRefGoogle Scholar
  5. 5.
    YAZAWA, K., and H. YAKO: The text-book for the lecture at the meeting of Appl. Phys. Soc. April 1957 (in Jap.).Google Scholar
  6. 6.
    HIROTA, S.: Electron Microscopy 6, 152 (1958) (in Jap.).Google Scholar
  7. 7.
    UEDA, R., and A. Nn: The text-book for the lecture at the meeting of Soc. of Electron Microscopy, May (1958) (in Jap.).Google Scholar
  8. 8.
    HIROTA, S., T. IMAI and H. NOAKI: Private communication.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1960

Authors and Affiliations

  • E. Sugata
    • 1
  • S. Nakamura
    • 1
  1. 1.Osaka UniversityOsakaJapan

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