真空电子技术Issue(3)：17-22,65,7.
钪型阴极表面微观发射结构的模拟计算
Numerical Simulation of Surface Microstructure of Scandate Cathodes
李泽鹏 1郝广辉 1李季1
作者信息
- 1. 北京真空电子技术研究所,北京100015
- 折叠
摘要
Abstract
Although the emitting mechanism is still unclear,scandate cathodes have attracted much attention owing to their high emission current density.It is generally believed that the surface emitting layer is BaxScy Oz-W structure,but the emission surface is dynamic,and so it is difficult to ascertain optimal surface emission structure.In this paper,the ideal emission structure of BaxScyOz-W on the surface of scandium cathode is modeled,and the work function is calculated by density functional theory (DFT).The minimum work function of Ba-O-Sc-O-W surface structure is 1.186 eV.Based on calculation results,the change of work function corresponding to different surface atomic structure is discussed.关键词
钪型阴极/功函数/密度泛函理论Key words
Scandate cathodes/Work function/DFT分类
信息技术与安全科学引用本文复制引用
李泽鹏,郝广辉,李季..钪型阴极表面微观发射结构的模拟计算[J].真空电子技术,2017,(3):17-22,65,7.
