一、引言虽然目前绝大多数电子器件都采用热电子阴极,但由于它的消耗功率过大,对大量使用电子器件的仪器和能源供给困难的地方不能满足要求。同时由于热子和幅射现象的存在,体积也不能极度缩小,对小型化是个障碍。因此人们对非热方法产生电子发射的冷阴极产生了极大的兴趣。氧化镁冷阴极就是其中之一。由于它在工作时不需要象热电子阴极那样 I. INTRODUCTION Although the vast majority of electronic devices currently use hot electron cathodes, their power consumption is too large to meet the requirements of large-scale use of electronic equipment and energy supply. At the same time due to the existence of heat and radiation phenomenon, the volume can not be extremely reduced, is an obstacle to miniaturization. Therefore, there has been a great deal of interest in non-thermal methods of producing cold cathode cathodes for electron emission. Magnesia cold cathode is one of them. Because it does not need to work like a hot cathode