Physical operating principles of scandate cathodes for microwave devices

The electronic structure of barium oxide crystallites determining the emission properties of both dispenser and scandate cathodes has been studied using electron spectroscopy for chemical analysis, electron energy loss spectroscopy, and optical spectroscopy. It has been established that the other el...

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Bibliographic Details
Published inTechnical physics Vol. 62; no. 1; pp. 116 - 126
Main Authors Kapustin, V. I., Li, I. P., Shumanov, A. V., Lebedinskii, Yu. Yu, Zablotskii, A. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 2017
Springer
Springer Nature B.V
Subjects
Aluminum
Analysis
Barium
Calcium aluminate
Cathodes
Chemical analysis
Classical and Continuum Physics
Crystallites
Dilution
Electron energy
Electron energy loss spectroscopy
Electron spectroscopy
Electronic devices
Electronic structure
Electrons
Emission analysis
Microwave equipment
Physical Electronics
Physics
Physics and Astronomy
Rare earth metal compounds
Rare earth metals
Scandium
Spectrum analysis
Tungsten
Tungsten compounds
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Summary:The electronic structure of barium oxide crystallites determining the emission properties of both dispenser and scandate cathodes has been studied using electron spectroscopy for chemical analysis, electron energy loss spectroscopy, and optical spectroscopy. It has been established that the other elements (calcium, aluminum, scandium, and tungsten) contained in cathode materials are diluted in barium oxide and significantly affect its electronic structure and, consequently, emission properties. The obtained results give an idea about the physical and physicochemical mechanisms of the effect of scandium on the reduction of the work function of scandate cathodes relative to that of the cathodes of other types.
ISSN:1063-7842
1090-6525
DOI:10.1134/S1063784217010108