Abstract
The field emission characteristics of cathode matrices based on nanocomposite diamond-graphite film structures with a strengthening tunnel-thin diamond coating are studied. It is shown that field emission characteristics are not related to the morphology of the emitting surface and cannot be explained in terms of the Fowler and Nordheim model. The effect of the thickness of the diamond coating on the field emission characteristics and dielectric strength of the cathode heterostructure is established. The interpretation of the obtained laws is based on an increase in the transparency of potential barriers for electron tunneling due to a decrease in the forces of the mirror image
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