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本文用俄歇电子谱仪和X射线光电子谱仪研究了氧化物阴极在分解激活过程中表面、基底和涂层交界面的化学成分、化学态以及基底中的激活剂对涂层的作用。获得的实验结果表明,在激活过程中,阴极表面诸成分的原子浓度百分比发生了明显变化,产生了超额Ba。基底中的激活剂Mg对超额Ba的产生起重要作用。充分激活的阴极表面层是由(Ba,Sr,Ca)O和超额Ba构成的。超额Ba是电子发射的源泉。
In this paper, the chemical composition, chemical state and the activator in the substrate on the surface, substrate and coating interface during oxide decomposition and activation were studied by Auger electron spectroscopy and X-ray photoelectron spectroscopy. The experimental results obtained show that during the activation process, the atomic percentage of the components of the cathode surface has undergone significant changes, resulting in excess Ba. The activator Mg in the substrate plays an important role in the production of excess Ba. The fully activated cathode surface layer is composed of (Ba, Sr, Ca) O and excess Ba. Excess Ba is the source of electron emission.