Thermionic Electron Emission Capacity of the Ba3ScGa2O7.5 Impregnated Cathode

被引：0

作者：

Wang, Chenning ^{[1
]}

Zhou, Xiaoyu ^{[1
]}

Jiang, Tianqi ^{[2
]}

Xu, Zhenrui ^{[1
]}

Balfour, Esmond A. ^{[3
]}

Fu, Hao ^{[1
]}

机构：

[1] Univ Elect Sci & Technol China, Sch Phys, Chengdu 611731, Peoples R China

[2] Univ Elect Sci & Technol China, Glasgow Coll, Chengdu 611731, Peoples R China

[3] CK Tedam Univ Technol & Appl Sci, Sch Phys Sci, Dept Appl Phys, Navrongo 610054, Ghana

来源：

IEEE TRANSACTIONS ON ELECTRON DEVICES | 2024年 / 71卷 / 11期

关键词：

Barium; Cathodes; Compounds; Temperature measurement; Electron emission; Tungsten; Thermionic emission; Powders; X-ray scattering; Temperature distribution; Ba3ScGa2O7.5; environmental stability; high-temperature solid-state method; thermionic emission; DISPENSER CATHODES; PHASE-COMPOSITION; BAO;

D O I：

10.1109/TED.2024.3465443

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The high content of Ba and Sc in Ba3ScGa2O7.5 and its suitable melting point suggest that it is a candidate for thermionic emission in vacuum electron devices. To study its electron emission capacity, this compound was synthesized at 1300 degrees C by a high- temperature solid-phase method with the stoichiometric mole ratio of BaCO3:Sc2O3:Ga2O3= 6:1:2. The test cathode impregnated with this material had a high emission capacity with the full-space charge current density of 10.2 A/cm(2) at 850 degrees C in the dc mode. The sintered mixture of the compound and tungsten powder reveals that the formation of Ba3Sc2WO9 on the cathode surface leads to reduced work function and thus enhanced emission performance. The titled compound is environmentally stable with a low weight gain percentage (4.51%) and a steady phase in the air for 288 h. Coupled with the high emission current density at low temperatures, the cathode impregnated with Ba3ScGa2O7.5 compound has superior thermionic cathode properties and promising applications in vacuum electron devices.

引用

页码：7106 / 7111

页数：6

共 36 条

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