Abstract
The effect of microimpurities in barium oxide on the parameters of its electronic structure and, accordingly, on the work function is demonstrated experimentally and substantiated theoretically considering the decisive role of oxygen vacancies in the formation of thermoemission properties of barium oxide crystallites. It is found that depending on the crystallite size in the nanosize region, scandium microimpurities in barium oxide crystallites lead to the formation of various types of domains enriched in scandium atoms and characterized by a smaller work function on the crystallite surface. A physical model is proposed and the dependence of the work function of the domains on the temperature and concentration of oxygen vacancies in barium oxide crystallites doped with scandium atoms is calculated theoretically for different types of domains. The experimental technique permitting a correct physical determination of emission properties of scandate cathodes is formulated.
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REFERENCES
B. Ch. Dyubua and O. V. Polivnikova, Elektron. Tekh. Ser. 1. SVCh-Tekh., No. 4, 187 (2013).
B. Ch. Dyubua and A. N. Korolev, Elektron. Tekh. Ser. 1. SVCh-Tekh., No. 1, 5 (2011).
L. Schoenbeck, Investigation of Reactions between Barium Compounds and Tungsten in a Simulated Reservoir Hollow Cathode Environment (Georgia Inst. of Technology, 2005).
G. Gartner, P. Geintter, and A. Ritz, Appl. Surf. Sci. 111, 11 (1997).
I. Brodie and B. Vancil, in Proc. IEEE Int. Vacuum Electronics Conf., Monterey,2014, p. 53.
I. I. Bekh, O. I. Getman, V. V. Il’chenko, A. E. Lushkin, V. V. Panichkina, and S. P. Rakitin, Ukr. J. Phys. 54, 297 (2009).
V. I. Kapustin, Izv. Akad. Nauk SSSR. Ser. Fiz. 55, 2455 (1991).
V. I. Kapustin, Perspekt. Mater., No. 2, 5 (2000).
V. I. Kapustin, I. P. Li, A. V. Shumanov, Yu. Yu. Lebedinskii, and A. V. Zablotskii, Tech. Phys. 62, 116 (2017).
V. I. Kapustin, I. P. Li, V. S. Petrov, N. E. Ledentsova, and A. V. Turbina, Elektron. Tekh. Ser. 1. SVCh-Tekh., No. 1, 8 (2016).
I. Brodie and B. Vancil, in Proc. IEEE Int. Vacuum Electronics Conf., Monterey,2014, p. 53.
Physical and Chemical Properties of Oxides. Handbook, Ed. by G. V. Samsonov, A. L. Borisova, T. G. Zhidkova, (Metallurgiya, Moscow, 1978).
S. Glasstone, K. J. Laidler, and H. Eyring, The Theory of Rate Processes (McGraw-Hill, New York, 1941).
S. G. Davison and J. D. Levine, Surface States (Academic, 1970).
R. S. Raju and C. E. Maloney, IEEE Trans. Electron Devices 41 (12), 134 (1994).
V. I. Kapustin, I. P. Li, and A. V. Shumanov, Tech. Phys. 63, 460 (2018).
V. I. Kapustin, I. P. Li, and A. V. Shumanov, Tech. Phys. Lett. 43, 875 (2017).
M. D. Bel’skii, G. S. Bocharov, A. V. Eletskii, and T. J. Sommerer, Tech. Phys. 55, 289 (2010).
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Translated by N. Wadhwa
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Kapustin, V.I., Li, I.P., Shumanov, A.V. et al. Theory of Thermionic Emission of Scandate Cathodes. Tech. Phys. 65, 151–160 (2020). https://doi.org/10.1134/S1063784220010107
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DOI: https://doi.org/10.1134/S1063784220010107