| Numéro |
J. Phys. Colloques
Volume 50, Numéro C8, Novembre 1989
36th International Field Emission Symposium
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|
|---|---|---|
| Page(s) | C8-85 - C8-90 | |
| DOI | https://doi.org/10.1051/jphyscol:1989815 | |
36th International Field Emission Symposium
J. Phys. Colloques 50 (1989) C8-85-C8-90
DOI: 10.1051/jphyscol:1989815
Department of Physics, University of Poona, Pune-411 007, India
J. Phys. Colloques 50 (1989) C8-85-C8-90
DOI: 10.1051/jphyscol:1989815
PENCIL LEAD FIELD EMITTER
R.S. KHAIRNAR et D.S. JOAGDepartment of Physics, University of Poona, Pune-411 007, India
Abstract
Field electron emission from 2H and HB grades of pencil lead has been studied. The pencil lead field emitter is found to obey the Fowler-Nordheim characteristics. The emission current fluctuations are found to increase with the residual gas pressure and the emission current. The current density of the order of 106 amp/cm2 could be drawn from these emitters. The emission stability over the operation of six hours has been found to be reasonably good. The field ion microscopy of the 2H and HB grade pencil lead has been carried out depicting the lesser degree of graphitization in the 2H grade in comparison with the HB grade. A comparison of the two grades of emitters has been made in view of the respective degrees of graphitization.