Vacuum evaporation synthesizing Sc film layer and elucidation of near-surface Ba-O-Sc electronic configuration for dispenser cathode - Details

Author：

Indexed by：

EI Scopus SCIE

Abstract：

One　of　the　important　issues　with　the　scandate　cathode　is　the　mechanism　by　which　Sc　works　on　the　cathode　surface.　A　surface　Sc-rich　dispenser　cathode　was　prepared　via　the　vacuum　evaporation　method　to　clarify　the　role　of　Sc　in　the　cathode　performance.　The　XPS　results　indicate　that　the　surface　chemical　state　of　Sc　on　the　surface　after　activation　is　consists　of　Sc0　and　ScƐ+　(0＜Ɛ＜3).　Furthermore,　the　adsorption　energy,　the　work　function,　charge　density　difference,　polarization　effect　and　dipole　moment　of　the　Bax-Oy　adsorbed　on　the　Sc　surface　were　calculated　by　means　of　first-principles　calculations.　The　results　show　that　the　work　function　of　the　Bax-Oy　dipole　adsorbed　on　the　Sc　is　1.9–2.8　eV　with　the　average　value　of　2.262　eV,　which　is　consistent　with　the　experimentally　measured　result.　The　work　function　of　Bax-Oy　adsorbed　Sc　(002)　gets　to　the　lowest　at　a　coverage　of　25　%O-25　%Ba.　The　change　of　dipole　moment　due　to　polarization　and　charge　transfer　in　the　adsorbed　layer　could　affect　the　work　function.　©　2024　Elsevier　B.V.

Keyword：

Work function Dispenser cathode Electron emission Scandium film

Author Community：

[ 1 ] [Sun J.]Key Laboratory of Advanced Functional Materials of Education Ministry of China, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 2 ] [Yang Y.]Key Laboratory of Advanced Functional Materials of Education Ministry of China, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 3 ] [Dong L.]Key Laboratory of Advanced Functional Materials of Education Ministry of China, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 4 ] [Liu Z.]Key Laboratory of Advanced Functional Materials of Education Ministry of China, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 5 ] [Liu P.]Key Laboratory of Advanced Functional Materials of Education Ministry of China, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 6 ] [Cai Y.]Key Laboratory of Advanced Functional Materials of Education Ministry of China, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 7 ] [Liu H.]Key Laboratory of Advanced Functional Materials of Education Ministry of China, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 8 ] [Wang J.]Key Laboratory of Advanced Functional Materials of Education Ministry of China, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China

Reprint Author's Address：

Email：

Show more details

Related Keywords：

Simple and efficient synthesis of [Ca24Al28O64]4+(4e−) electronic compounds and preliminary exploration of its electron emission as a cathode emitter
2024，Vacuum
Enhanced secondary electron emission properties of Zn doped MgO thin films prepared by aerosol assisted chemical vapor deposition
2023，MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
The mechanism of strontium doping to enhancing the electron emission performance of barium-tungsten cathode
2024，Surfaces and Interfaces
The electronic structures and work functions of (100) surface of typical binary and doped REB6 single crystals
2018，APPLIED SURFACE SCIENCE

Source ：

Applied Surface Science

ISSN： 0169-4332

Year： 2025

Volume： 679

6 . 7 0 0

JCR@2022

Cited Count：

WoS CC Cited Count：

SCOPUS Cited Count： 1

ESI Highly Cited Papers on the List： 0 Unfold All

WanFang Cited Count：

Chinese Cited Count：

30 Days PV： 7

Affiliated Colleges：

Get Fulltext

DOI Library Discovery Baidu Scholar Search SCOPUS

Type
Departments

All Years Choose Year From to