Abstract
A novel electron emitter with the characteristics of ferroelectric ceramic materials has been developed. The electron-emitting portion of the electron emitter has vacuum gaps between the upper electrode and the surface of the ferroelectric layer. We confirmed that there are two types of electron emission from the electron emitter. One is considered to be the emission of the electron charge from the ferroelectric surface during a positive polarization reversal. In this paper, the characteristics and mechanism of the other type of electron emission are discussed which is expected to have high efficiency. We consider that field emission occurs as induced by the electric field concentrated in the vacuum gap transiently during a negative polarization reversal. A suitable electric conductivity of the ferroelectric surface is considered to be required for electron emission.
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