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This article is cited in 8 scientific papers (total in 8 papers)
Physical electronics
Physical operating principles of palladium–barium cathodes of microwave devices
V. I. Kapustina, I. P. Lib, A. V. Shumanovab, S. O. Moskalenkoab, A. A. Busha, Yu. Yu. Lebedinskiic a MIREA — Russian Technological University, Moscow
b JSC Pluton, Moscow
c Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow region
Abstract:
High-resolution X-ray diffraction method (XRD) is used to determine sizes and crystallographic orientation of the nanocrystallites of the Pd and Pd$_5$Ba 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.
Received: 06.07.2018 Revised: 01.11.2018 Accepted: 01.11.2018
Citation:
V. I. Kapustin, I. P. Li, A. V. Shumanov, S. O. Moskalenko, A. A. Bush, Yu. Yu. Lebedinskii, “Physical operating principles of palladium–barium cathodes of microwave devices”, Zhurnal Tekhnicheskoi Fiziki, 89:5 (2019), 771–780; Tech. Phys., 64:5 (2019), 720–729
Linking options:
https://www.mathnet.ru/eng/jtf5626 https://www.mathnet.ru/eng/jtf/v89/i5/p771
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