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Abstract
Electron emission into vacuum from PZT ferroelectric ceramic plate coated with MgO thin film has been observed under the application of electric field of pulse consisting of a pair of positive and negative voltages. The damage surface of electrode and PZT ceramic without MgO coating before and after the electron emission has been observed by microscope, and the damage is considered to spread out from the triple point. A high-intensity electric filed exists near the triple point and probably results in the generation of a plasma, which damages the surface of the electrode and makes the electron emission unstable. The MgO coating of the surface of the electrode and PZT has made the emission stable and also enlarged cycles of electron emission.