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Schematic for measurement of reverse field FE currents and SEM image of .
(a) FE current density as a function of applied field ( curve) for the anode of (◼) and (●) and (b) the same FE currents on a logarithmic scale to determine the turn-on field of the samples.
FN plots for the anode of (◼) and (●).
Turn-on field, maximum FE current at , and the calculated value from the and samples.
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