The impact of surface plasma on the total emission charge from PZST cathode induced by nanosecond electric pulse

Abstract

Electron emission from antiferroelectric ( \(\hbox {Pb}_{0.99}\hbox {Nb}_{0.02})\hbox {[(Zr}_{0.80}\hbox {Sn}_{0.20})_{0.952}\hbox {Ti}_{0.048}\hbox {]}_{0.98}\hbox {O}_{3}\) cathode has been investigated. The PZST cathode can maintain a metastable ferroelectric phase by the application of a high-enough field, thus implying three possibly pulse-loading configurations for electron emission measurements. The fact that emission charge is larger than the non-compensated charge indicates that the surface plasma contributes to the total emission charge. Furthermore, \(\chi _i \;(i=\text {A, B, C})\) , characterising the contribution of surface plasma to the total emission charge, was defined. It was found that the emission charge increases almost linearly with \(\chi _i \) . Our results are of great importance for a better understanding of electron emission in antiferroelectric / ferroelectric cathodes.

http://bit.ly/2DMXQxy