Journal of Nuclear Science, Engineering and Technology (JONSAT)
In cooperation with the Iranian Nuclear Society

Measurement of Current Density and Work Function of Oxide Coated Cathode Sintered with Ni –Powder

Document Type : Research Paper

Authors

T Tohidi
Sh Rahmatollahpoor
Abstract
Oxide coatedcathodes are by far the most important thermionic emitter of electrons which are used in various electron tubes such as thyratrons. In this research, an oxide coated cathode, sintered with Ni-powder with cross section of 0.07cm2 has made and its electron emission parameters such as current density and the work function (Φ=1.62eV) have been measured.
 

Highlights

  1. 1.    J.F. Richardson, “Evaporation and diffusion rate measurements on cathodes of sintered nickel containing alkaline-earth oxides,” British Journal of Applied Physics, Vol. 11, February (1960).

 

  1. 2.    L.R. Koller, “Electron emission from oxide coated filaments,” phys.Rev. 25, 671 (1925).

 

  1. 3.    A.S. Eisenstein, “Advances in electronics. I. oxide coated cathodes,” Academy Press, Inc., New York (1948).

 

  1. 4.    P. Zalm, “Thermionic cathodes,” Adv. Electron. Electron Phys. 25, 211 (1968).

 

  1. 5.    T. Hira, H. Teramoto, M. Saito, T. Shinjo, T. “An analysis of the surface of the Ni-W layer of a tungsten film coating cathode,” Applied Surface Science, 146 (1), p.47-50, May (1999).

 

  1. 6.     F. Poret, J.M. Roquais, “The base metal of the oxide-coated cathode,” Applied Surface Science, 251, 31-41 (2005).

 

  1. 7.     Xianheng Liao, Xiaoxia Wang Qinglan Zhao, Mingfen Meng, “Development of new types of oxide cathodes,” Applied Surface Science 251 64-68 (2005).

 

  1. 8.     Xiaoxia wang, Xianheng Liao, Jirun Luo, Qinglan Zhao, “An improved reservoir Oxide cathode,” Applied surface scienc 251 69-72 (2005).

 

  1. 9.     D.S. Barratt, S.N. Jenkins, “The evolution  of oxide cathodes for cathode ray tube applications,” J. Mater. Sci. Mater Electron 17, 735 (2006).

 

10. A. Shih, “High emission density thermionic cathode,” workshop on cathodes for relativistic electron beams,Naval Research Laboratory Washington D.C.May 10-11 (2001).

 

11. R.L. Ramey, “Physical electronics,” Wadsworth Publishing Company (1962).

 

12. W.B. Nottingham, “Thermionic Emission,” Technical Rerport No. 321 December 10, MIT (1356).

 

13. G.W. Mahlman, “Work function and conductivity of oxide-coated cathodes,” Technical Report No. 67 MIT May 31, (1948).

 

14. G. Gaertner, Daniel den Engelsen, “Hundred years anniversary of the oxide cathode. A historical review,” Applied Surface Science 25, 24-30 (2005).

 

15. H. Friedenstein, S.L. Martin, G.L. Munday, “The mechanism of the thermionic emission from oxide coated cathodes,” Rep. Prog. Phys, 11, 298-341 (1946).

 

16. S. Yamamoto, “Fundamental physics of vacuum electron sources,” Rep. Prog. Phys. 69 181-232 (2006).

 

17. ت. توحیدی، ش. رحمت‌اله‌پور، ”اندازه‌گیری چگالی جریان و تابع کار کاتدهای اکسیدی،“ کنفرانس فیزیک ایران، (شهریور 1384).                                                                                     

 

18. V.S. Fomenko, “Hand Book of Thermionic Properties,” NewYork, Plenum (1966).

 

19. C.P. Hadley, “Thermionic emission from oxide-coated tungsten filaments,” Technical Report No. 218, MIT (1951).

Keywords

Oxide Cathode
Current Density
Electron Tube
Work Function
  1. 1.    J.F. Richardson, “Evaporation and diffusion rate measurements on cathodes of sintered nickel containing alkaline-earth oxides,” British Journal of Applied Physics, Vol. 11, February (1960).

 

  1. 2.    L.R. Koller, “Electron emission from oxide coated filaments,” phys.Rev. 25, 671 (1925).

 

  1. 3.    A.S. Eisenstein, “Advances in electronics. I. oxide coated cathodes,” Academy Press, Inc., New York (1948).

 

  1. 4.    P. Zalm, “Thermionic cathodes,” Adv. Electron. Electron Phys. 25, 211 (1968).

 

  1. 5.    T. Hira, H. Teramoto, M. Saito, T. Shinjo, T. “An analysis of the surface of the Ni-W layer of a tungsten film coating cathode,” Applied Surface Science, 146 (1), p.47-50, May (1999).

 

  1. 6.     F. Poret, J.M. Roquais, “The base metal of the oxide-coated cathode,” Applied Surface Science, 251, 31-41 (2005).

 

  1. 7.     Xianheng Liao, Xiaoxia Wang Qinglan Zhao, Mingfen Meng, “Development of new types of oxide cathodes,” Applied Surface Science 251 64-68 (2005).

 

  1. 8.     Xiaoxia wang, Xianheng Liao, Jirun Luo, Qinglan Zhao, “An improved reservoir Oxide cathode,” Applied surface scienc 251 69-72 (2005).

 

  1. 9.     D.S. Barratt, S.N. Jenkins, “The evolution  of oxide cathodes for cathode ray tube applications,” J. Mater. Sci. Mater Electron 17, 735 (2006).

 

10. A. Shih, “High emission density thermionic cathode,” workshop on cathodes for relativistic electron beams,Naval Research Laboratory Washington D.C.May 10-11 (2001).

 

11. R.L. Ramey, “Physical electronics,” Wadsworth Publishing Company (1962).

 

12. W.B. Nottingham, “Thermionic Emission,” Technical Rerport No. 321 December 10, MIT (1356).

 

13. G.W. Mahlman, “Work function and conductivity of oxide-coated cathodes,” Technical Report No. 67 MIT May 31, (1948).

 

14. G. Gaertner, Daniel den Engelsen, “Hundred years anniversary of the oxide cathode. A historical review,” Applied Surface Science 25, 24-30 (2005).

 

15. H. Friedenstein, S.L. Martin, G.L. Munday, “The mechanism of the thermionic emission from oxide coated cathodes,” Rep. Prog. Phys, 11, 298-341 (1946).

 

16. S. Yamamoto, “Fundamental physics of vacuum electron sources,” Rep. Prog. Phys. 69 181-232 (2006).

 

17. ت. توحیدی، ش. رحمت‌اله‌پور، ”اندازه‌گیری چگالی جریان و تابع کار کاتدهای اکسیدی،“ کنفرانس فیزیک ایران، (شهریور 1384).                                                                                     

 

18. V.S. Fomenko, “Hand Book of Thermionic Properties,” NewYork, Plenum (1966).

 

19. C.P. Hadley, “Thermionic emission from oxide-coated tungsten filaments,” Technical Report No. 218, MIT (1951).

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