First-Principles Study on the Surface Work Function and Adsorption Energy of Barium-Tungsten Cathode Doped with Vanadium and Strontium

LIU Ji-chen; SHAO Wen-sheng; ZHANG Ke

doi:10.12263/DZXB.20211286

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First-Principles Study on the Surface Work Function and Adsorption Energy of Barium-Tungsten Cathode Doped with Vanadium and Strontium

PAPERS | 更新时间：2025-12-08

- First-Principles Study on the Surface Work Function and Adsorption Energy of Barium-Tungsten Cathode Doped with Vanadium and Strontium
- ACTA ELECTRONICA SINICA Vol. 51, Issue 7, Pages: 1977-1982(2023)
- 作者机构：
  
  中国电子科技集团公司第十二研究所，北京 100015
- 作者简介：
- 基金信息：
- DOI：10.12263/DZXB.20211286
  CLC： TN1;O462
- Received：21 September 2021，
  
  Revised：2022-03-08，
  
  Published：25 July 2023
- 稿件说明：
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刘继琛,邵文生,张珂.第一性原理研究掺入钒、锶的钡钨阴极表面功函数及吸附能[J].电子学报,2023,51(07):1977-1982.

LIU Ji-chen,SHAO Wen-sheng,ZHANG Ke.First-Principles Study on the Surface Work Function and Adsorption Energy of Barium-Tungsten Cathode Doped with Vanadium and Strontium[J].ACTA ELECTRONICA SINICA,2023,51(07):1977-1982.
刘继琛,邵文生,张珂.第一性原理研究掺入钒、锶的钡钨阴极表面功函数及吸附能[J].电子学报,2023,51(07):1977-1982. DOI： 10.12263/DZXB.20211286.

LIU Ji-chen,SHAO Wen-sheng,ZHANG Ke.First-Principles Study on the Surface Work Function and Adsorption Energy of Barium-Tungsten Cathode Doped with Vanadium and Strontium[J].ACTA ELECTRONICA SINICA,2023,51(07):1977-1982. DOI： 10.12263/DZXB.20211286.

摘要

应用第一性原理赝势法，构建了不同的阴极表面原子模型，并计算了功函数和吸附能.以

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20.82799911

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面为基础，在表面的顶位、桥位和洞位分别吸附1 ML的O原子，发现O原子更倾向于吸附在顶位，并且功函数最大.将Ba原子吸附在W-O表面后，发现Ba原子更有可能吸附在洞位，表面最佳覆盖度在0.5 ML左右.在W-O-Ba表面的洞位吸附V原子和Sr原子，发现同时吸附2种原子后体系的吸附能更有可能取决于最后吸附的原子，V的吸附使表面功函数降低，Sr使表面功函数升高.最后制备了掺入3%钒酸锶的新型钡钨阴极，在1 050 ℃下脉冲发射电流密度达8.71 A/cm

，高于普通铝酸盐钡钨阴极的6.77 A/cm

，通过实验证实理论仿真具有合理性，可以进一步优化表面结构，提高阴极发射能力.

Abstract

Using first-principles pseudopotentials

different atomic models of the cathode surface are constructed

and the work function and adsorption energy are calculated. Based on the (2×2×1)W(001) plane

1 ML of oxygen atoms are adsorbed on the top

bridge

and hole positions on the surface. It is found that O atoms are more inclined to be adsorbed at the top and have the largest work function. After adsorbing Ba atoms on the surface of W-O

it is found that Ba atoms are more likely to be adsorbed on the hole

and the best surface coverage is about 0.5 ML. V atoms and Sr atoms are adsorbed in the holes on the surface of W-O-Ba

and it is found that the adsorption energy of the system after the two atoms are adsorbed at the same time is more likely to depend on the last adsorbed atom. The adsorption of V makes the surface work function decrease

while Sr makes the surface work function increase. Finally

a new type of barium tungsten cathode doped with 3% strontium vanadate is prepared

and the pulse emission current density reaches 8.71 A/cm

at 1 050 ℃

which is higher than the 6.77 A/cm

of ordinary barium aluminate cathode. The theoretical simulation results are verified to be reasonable by experiments

and it can further optimize the surface structure and improve the cathode emission performances.

关键词

Keywords

references

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