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Field electron microscope study of niobium surfaces
Author(s) -
Savage William R.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680250112
Subject(s) - niobium , field electron emission , work function , cathode , materials science , crystal (programming language) , electron , field emission microscopy , field (mathematics) , electron microscope , superconductivity , field emission gun , single crystal , thermal , condensed matter physics , atomic physics , crystallography , optics , nanotechnology , chemistry , transmission electron microscopy , physics , diffraction , metallurgy , nuclear physics , thermodynamics , computer science , layer (electronics) , programming language , pure mathematics , mathematics
Abstract An account is presented of field emission experiments on contaminated and clean niobium surfaces. It is concluded that the equilibrium thermal end‐forms of niobium single crystal emitters consist of small flat regions of low index crystallographic directions smoothly joined by transition planes to give a shape close to spheroidal. Fowler‐Nordheim graphs of the voltage‐current characteristics of the thermally cleaned cathodes gave a work function of (4.1 ± 0.1) eV which agrees with the results of other measurements.