铝酸盐钡钨阴极中掺氧化钙和氧化钪的作用机理

吴兆皓

铝酸盐钡钨阴极中掺氧化钙和氧化钪的作用机理

吴兆皓

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出版历程
- 收稿日期: 1985-12-02
- 修回日期: 1987-03-17
- 刊出日期: 1987-07-19

STUDY ON THE ROLE OF CALCIUM OXIDE AND SCANDIUM OXIDE IN THE IMPREGNATED BARIUM ALUMINATE CATHODE

Wu Zhaohao

摘要

摘要: 各种铝酸盐钡钨阴极的发射物质中存在着2BaOCaOAl2O3和可利用氧化钡的共同成分。氧化钙的作用在于参予组成了2BaOCaOAl2O3相成分,稳定了可利用氧化钡。在掺氧化钪的发射物质5BaO3CaO2Al2O30.6Sc2O3中,氧化钪的作用则在于它和铝酸盐中的可利用氧化钡结合为2BaOSc2O3,成为电子发射源氧化钡或钡原子的载体,它起控制和补充发射源的作用。这个机理得到实验证实。
Abstract: The role of calcium oxide in the barium aluminate and that of calcium oxide and scandium oxide both doped in the impregnated barium aluminate cathode are analytically studied. The results indicate that there are common consitituents, i.e. 2BaO CaO Al2O3 and utilizable barium oxide in the emission substances of various impregnated barium-calcium-aluminate cathodes. The calcium oxide in the barium aluminates participates in constituting 2BaOCaOAl2O3. It makes the utilizable barium oxide stable. The scandium oxide doped in the barium-calcium-aluminate 5BaO3CaO2Al2O30.6Sc2O3 compound is supposed to be a carrier for aarium oxide or barium atom which is the electron source, and it plays the role in controlling and roplonishing the electron source. The proposed mechanism has been proved by some experimental data.

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