影响稀土氧化物-钼阴极次级发射性能的因素

Factors Affected Secondary Emission Properties of Rare Earth Oxide Molybdenum

通过不同的工艺制备了稀土氧化物 钼(RE2O3 Mo)阴极材料的次级发射体,测定了材料的次级发射性能,采用SEM和能谱分析等手段研究了材料的微观结构。实验结果表明,影响材料次级发射性能的因素有:材料的化学成分、掺杂方式、烧结方法、热激活温度等。所有利于提高材料表面稀土氧化物含量的因素均可以提高材料的次级发射性能,这是因为稀土氧化物中的自由电子比较少,由一次电子激发出的二次电子在离开材料时,与材料体内自由电子碰撞的机会就小,而提高材料的次级发射性能。

The rare earth oxide molybdenum emitters were processed by different methods, and the secondary emission coefficients of those materials were measured with electron gun method. The material microstructure was also studied through SEM and EDAX. The results show that the affect factors the secondary emission coefficient of the materials are the composition, doping method, sintering method, activated temperature and so on.