Applied physics

, Volume 22, Issue 1, pp 39–46 | Cite as

Cathodic needle growth from Mo(CO)6 and Cr(CO)6 vapors at lower electric fields

  • F. Okuyama
Contributed Papers


A cathodic needle growth which is possibly associated with the temperature-field (T-F) electron emission is described. Experimental data disclosed that densely populated needle crystals exhibiting a dendritic configuration growth at the tip area of a pointed cathode when it is operated in an Mo(CO)6 or Cr(CO)6 atmosphere at a field strength just insufficient to draw field electrons. The needle growth occurs always at elevated temperatures of ∼600–∼700 K, indicating that it is triggered by T-F electrons emitted from the cathode tip. Needle crystals produced are not single crystals but composed of linearly packed micro-crystals, and those crystals obtainable from Mo(CO)6 are a face-centered cubic phase of Mo2C. Needles arising from Cr(CO)6 have not been identified, but they are believed to be an unknown phase of chromium carbide.


68.70 79.40 81 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    H.E.Cline: J. Appl. Phys.41, 76 (1970)CrossRefADSGoogle Scholar
  2. 2.
    H.D.Beckey, E.Hilt, H.-R.Schulten: J. Phys. E6, 1043 (1973)CrossRefADSGoogle Scholar
  3. 3.
    H.B.Linden, E.Hilt, H.D.Beckey: J. Phys. E11, 1033 (1978)CrossRefADSGoogle Scholar
  4. 4.
    F.Okuyama, T.Shibata, N.Yasuda: Appl. Phys. Lett.35, 6 (1979)CrossRefADSGoogle Scholar
  5. 5.
    F.Okuyama: J. Cryst. Growth (in press)Google Scholar
  6. 6.
    F.Okuyama: J. Appl. Phys.45, 4235 (1974)CrossRefADSGoogle Scholar
  7. 7.
    F.Okuyama: J. Cryst. Growth38, 103 (1977)CrossRefGoogle Scholar
  8. 8.
    H.B.Linden, H.D.Beckey, F.Okuyama: Appl. Phys.22, 83–87 (1980)CrossRefADSGoogle Scholar
  9. 9.
    F.Okuyama: Appl. Phys. Lett.36, 46 (1980)CrossRefADSGoogle Scholar
  10. 10.
    ASTM card, 15–457Google Scholar
  11. 11.
    J.J.Lander, L.H.Germer: Trans. AIME175, 648 (1948)Google Scholar
  12. 12.
    B.B.Owen, R.T.Webber: Trans. AIME.175, 693 (1948)Google Scholar
  13. 13.
    R.Gomer:Field Emission and Field Ionization (Harvard University Press, Cambridge 1961)Google Scholar
  14. 14.
    See, for example, W.P.Dyke, J.P.Barbour, E.E.Martin, J.K.Troland: Phys. Rev.99, 1192 (1955)CrossRefADSGoogle Scholar
  15. 15.
    J.M.Bermond, M.Lenoir, J.P.Prulhière, M.Drechsler: Surface Sci.42, 306 (1974)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • F. Okuyama
    • 1
  1. 1.Department of Fine MeasurementsNagoya Institut of TechnologyNagoyaJapan

Personalised recommendations