采用XRD、SEM和AES等分析方法对氧化钪混合钨基及浸渍后的阴极微观结构及表面活性元素的行为进行研究.结果表明:基体内Sc_2O_3弥散均匀分布.在阴极激活过程中,Ba和Sc从内部向表面扩散,在阴极表面形成含Ba、Sc、O的表面活性层,其厚度为M型阴极活性层厚度的10倍以上.对自由钪的产生机制进行了探讨.
The microstructure and physical behaviour of active substance of scandia mixed tungsten matrix and its impregnated cathode were studied by XRD, SEM, and AES methods. The results show that Sc_2O_3 dispersed evenly in the matrix. During the activation period of the cathode, the surface active layer containing Ba, Sc and O is formed due to the simultaneous diffusion of Ba, Sc and O from the inner part of the cathode to the surface. The thickness of this active layer is more than ten times larger than that of "M" type cathode. The production mechanism of free scandium was discussed.
参考文献
| [1] | G(a)rtner G;Geittner P;Lydtin H et al.[J].Applied Surface Science,1997,111:11. |
| [2] | Shih Yater J E;Hor C .[J].Applied Surface Science,2002,191:44. |
| [3] | 王金淑,陶斯武,王亦曼,李洪义,张久兴,周美玲.钪系阴极基体的研究[J].稀有金属材料与工程,2004(03):324-328. |
| [4] | 杨飒,周美玲,王金淑,李洪义,左铁镛.放电等离子体烧结复合稀土钼阴极的次级发射性能及组织的研究[J].稀有金属材料与工程,2003(11):950-953. |
| [5] | Müler W .[J].Applied Surface Science,1997,111:30. |
| [6] | Zagwijn P M;Frenken J W M;van Slooten U et al.[J].Applied Surface Science,1997,111:35. |
| [7] | Uda E;Nakamura O;Matsumoto S et al.[J].Applied Surface Science,1999,146:31. |
| [8] | Yamamoto S;Watanabe I;Taguchi S et al.[J].IEEE Transactions on Electron Devices,1989,928:490. |
| [9] | Kawano T.;Shimizu R.;Takai Y. .Characterization of Sc-O/W(100) surface as Schottky emitter: Work function change for activation processing[J].Japanese journal of applied physics,2000(2A):577-580. |
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