论文部分内容阅读
用场发射扫描电镜(SEM)、俄歇电子能谱仪(AES)、扫描俄歇电子微探针(SAM)、x-射线光电子谱仪(XPS)、发射电子显微镜(THEM)和逸出功测量技术等,对铝酸盐Ba-W阴极进行了综合研究。研究了阴极表面结构形貌、表面化学成分、表面化学态及其发射性能等。实验结果表明,激活前、后,阴极表面的元素组成成分、分布状况和化学态都有明显差异。激活后的阴极表面粗糙,发射不均匀。对应于低逸出功的高发射区是钨海绵的孔隙及其周围,它们构成非均匀分布的发射中心。Ba和O是电子发射的关键性元素,激活后的阴极表面是W-BaO(Ba)系结构。
The emission spectra were characterized by field emission scanning electron microscopy (SEM), Auger electron spectroscopy (AES), scanning Auger electron microprobe (SAM), x-ray photoelectron spectroscopy (XPS), transmission electron microscopy (THEM) Technology, etc., a comprehensive study of the aluminate Ba-W cathode. The cathode surface morphology, surface chemical composition, surface chemical state and its emission properties were studied. The experimental results show that the elemental composition, distribution and chemical state of cathode surface are obviously different before and after activation. After activation, the cathode surface is rough and the emission is not uniform. The high emission region corresponding to a low work function is the pores of the tungsten sponge and its surroundings, which form a non-uniformly distributed emission center. Ba and O are the key elements of electron emission, and the activated cathode surface is W-BaO (Ba) -based structure.