碳化La_2O_3-Mo阴极材料的高温XPS研究

High Temperature XPS Study of Carburized La_2O_3-Mo Cathode Material

摘要:

采用高温 X射线光电子能谱 (XPS)对碳化 La2 O3- Mo阴极材料表面 La的价态进行了研究。结果表明 ,材料中的 La2 O3可以被 Mo2 C还原成单质 La。单质 La的结合能高于 La2 O3的结合能。从实验上证实单质 La3d5/2的结合能为 835.96e V,并首次给出单质 La3d3/2结合能实验数值为 852 .2 3e V。

关键词:镧,价态,La_2O_3-Mo,阴极,高温XPS

Abstract:

The valence of lanthanum on the surface of carburized La 2O 3 Mo cathode material has been studied using high temperature X ray photoelectron spectroscopy(XPS). The experimental results show that La 2O 3 in the La 2O 3 Mo cathode material can be reduced to metalic lanthanum by molybdenum carbide (Mo 2C). The binding energy of metallic lanthanum is higher than that of La 2O 3, The La3d5/2 binding energy of metallic lanthanum has been proved to be 835 96 eV experimentally. This paper reports for the first time that the experimental La3d3/2 binding energy of metallic lanthanum is 852 23 eV .

Key words:lanthanum, valence, La 2O 3 Mo, cathode, high temperature XPS Biography: Wang Jinshu, Associate Professor, School of Materials Science and Engineering, Beijing Polytechnic University, Beijing 100022, P. R. China, Tel:[phone],