Preparation and "in situ" analysis of La coated Mo cathodes

被引：2

作者：

Hao, SM ^{[1
]}

Nie, ZR ^{[1
]}

Yang, HC ^{[1
]}

Xi, XL ^{[1
]}

机构：

[1] Beijing Univ Technol, Sch Mat Sci & Engn, Mat Minist Educ, Key Lab Adv Funct, Beijing 100022, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2005年 / 251卷 / 1-4期

关键词：

thermionic emission; pulsed laser deposition; cathode; surface;

D O I：

10.1016/j.apsusc.2005.03.190

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This paper describes the surface analyses of "in situ" prepared Mo cathodes with a La coating. It was found that the electron emission depends strongly on the atomic La/O ratio at the surface: the higher this ratio, the better the emission. The emission current density increases sharply when the La/O ratio starts to deviate from the stoichiometric ratio of La2O3. A model, which describes the emission of La coated Mo cathodes qualitatively, is presented. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：97 / 100

页数：4