Hafnium carbide CFE, TFE, and schottky electron sources

We report on CFE and TFE cathodes using (310) oriented hafnium carbide. These have been operated in UHV and temperatures from 300 K to 1900 K. Emission data show dramatic increases while operating at elevated temperatures due to work function lowering. Artificial faceting using FIB techniques shows promise for this cathode operating in Schottky emission mode.