Experimental regularity of piezoelectric coefficient inthe electron emission with ferroelectric materials
The ferroelectric cathode material is a newkind of functional material.Anewelectron emission phenomena was observed by chance.With the increase of emission times,the piezoelectric coefficient decreased to zero firstly and then gradually approached to a given inverse value,whose absolute value was less than that of the initial value.Surprisingly,it was found that the current emission densi-ty had not changed during the course of the change of the piezoelectric coefficient.It is found that the experiment is repeatable.It is diffi-cult to explain the observed phenomena using the existing electron emission theory.