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Electric field profiles for different applied voltages at T = 25 °C.
Electric field profiles at 600 V for tested temperatures: T = (25, 30, 40, 50, 60) °C. Inset graph refers to the calculated space charge at the anode.
I-V characteristics at different temperatures. Current points corresponding to critical Vc voltages are also highlighted (linked squares). Also plotted the lines corresponding to the root squared (dot dash) and quadratic (dash) laws. In the inset, Arrhenius plot of the current values corresponding to Vc (activation energy Ea = −1.08 eV).
From (a) to (e) transients of the current (empty circles, blue on-line) and of electric field (full circles, red on-line) at the cathode, for T = (25, 30, 40, 50, 60) °C; (f) transients of the electric field at the anode, for the same temperatures. All data refer to 600 V.
Current transient data at 600 V and T = 60 °C plotted as a function of the corresponding field at the anode. Line represents data fit using Eq. (3).
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