Recent progress of rare earth oxide doped Molybdenum secondary electron emission cathodes

In this paper, the effect of different preparation process on the secondary electron emission performance was investigated. The different doping methods and preparation techniques such as Solid-Solid doping(SS), Liquid-Solid (LS) doping, Liquid-Liquid (LL) doping, Spark Plasma Sintering (SPS), Air Plasma Spray (APS) method, were introduced into this kind of materials. The microstructure of samples was observed with Hitachi S-3500N Scanning Electron Microscopy, equipped with Oxford Inca EDX equipment. The self-designed apparatus was used to evaluate secondary electron emission yields (δ) of samples in the ultra-high vacuum chamber. The secondary emission properties were measured at 600°C in order to avoid the influence of the thermionic emission.