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Tikhonov A. Technology of Investigation of Asynchronous Motors with a Squirrel-cage Rotor using a Universal Parametric Generator of a Finite-element Model [Електронний ресурс] / A. Tikhonov, Yu. Kazakov, A. Shmelev // Computational problems of electrical engineering. - 2013. - Vol. 3, № 2. - С. 113-117. - Режим доступу: http://nbuv.gov.ua/UJRN/CPoee_2013_3_2_23
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Shipko M. N. Magnetic Properties and Local Parameters of Crystal Structure for BaFe12O19 and SrFe12O19 Hexagonal Ferrites [Електронний ресурс] / M. N. Shipko, V. G. Kostishyn, V. V. Korovushkin, I. M. Isaev, M. A. Stepovich, A. I. Tikhonov, E. S. Savchenko // Журнал нано- та електронної фізики. - 2016. - Т. 8, № 3. - С. 03004-1-03004-4. - Режим доступу: http://nbuv.gov.ua/UJRN/jnef_2016_8_3_6 It is shown that difference between magnetic properties of hexagonal ferrites BaFe12O19 and SrFe12O19 is connected with difference of electronic configurations of Ba2+ and Sr2+ ions, and their ionic radii. Re-placement of Ba2+ ions by Sr2+ ions that are smaller in size effects the degree of distortions of octahedrons located either in a hexagonal R-block or at its boundary with S-block. It contributes to a preferred localization of electrically active vacancies at the boundary of R- and S-blocks or in a surface layer of crystallites, and provides residual polarization of ferrites with hexagonal structure.
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