Physical Operating Principles of Palladium–Barium Cathodes of Microwave Devices
- Авторы: Kapustin V.1, Li I.2, Shumanov A.1,2, Moskalenko S.1,2, Bush A.1, Lebedinskii Y.3
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Учреждения:
- Moscow Technological University MIREA
- OAO Pluton
- Moscow Institute of Physics and Technology
- Выпуск: Том 64, № 5 (2019)
- Страницы: 720-729
- Раздел: Physical Electronics
- URL: https://journals.rcsi.science/1063-7842/article/view/203466
- DOI: https://doi.org/10.1134/S1063784219050086
- ID: 203466
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Аннотация
High-resolution X-ray diffraction method (XRD) is used to determine sizes and crystallographic orientation of the nanocrystallites of the Pd and Pd5Ba phases in palladium–barium cathode. Electron spectroscopy for chemical analysis (ESCA) is used to study Ba and Pd chemical states in cathode material and determine the phase composition including dissolved microimpurities in the phases. The comparison of the XRD and ESCA data makes it possible to reveal effects related to the formation of the BaO crystallites in the cathode material, which are responsible for the emission properties. Electron-energy loss spectroscopy is used to determine the concentration of oxygen vacancies in the BaO crystallites that are formed in the cathode material due to activation. An original crystallite model of the working palladium–barium cathodes that is based on the results of this work may serve as an alternative to the known film model and makes it possible to optimize technology of cathode fabrication and activation.
Об авторах
V. Kapustin
Moscow Technological University MIREA
Автор, ответственный за переписку.
Email: kapustin@mirea.ru
Россия, Moscow, 119454
I. Li
OAO Pluton
Email: kapustin@mirea.ru
Россия, Moscow, 105120
A. Shumanov
Moscow Technological University MIREA; OAO Pluton
Email: kapustin@mirea.ru
Россия, Moscow, 119454; Moscow, 105120
S. Moskalenko
Moscow Technological University MIREA; OAO Pluton
Email: kapustin@mirea.ru
Россия, Moscow, 119454; Moscow, 105120
A. Bush
Moscow Technological University MIREA
Email: kapustin@mirea.ru
Россия, Moscow, 119454
Yu. Lebedinskii
Moscow Institute of Physics and Technology
Email: kapustin@mirea.ru
Россия, Dolgoprudnyi, Moscow oblast, 141700