Browsing by Author "Gritsyna, V. T."

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    Defects in magnesium aluminates spinel ceramics
    (Видавництво національного університету „Львівська політехніка”, 2009) Gritsyna, V. T.; Kazarinov, Yu. G.; Moskvitin, A. O.; Reimanis, I. E.
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    Growth and Characterization of Titanium Doped Spinel Crystals
    (2017-05-29) Gritsyna, V. T.; Kazarinov, Yu. G.; Kobykov, V. A.; Lytvynov, L. A.; V.N. Karazin Kharkiv National University, 4 Svoboda Sq., 61022 Kharkiv, Ukraine; NRC “Kharkov Institute of Physics and Technology”, 1 Akademicheskaya Str., 61108 Kharkiv, Ukraine; Institute for Single Crystals of NAS of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine
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    Infrared spectroscopy studies of magnesium aluminates spinel crystals
    (Видавництво Львівської політехніки, 2012) Kobyakov, V. A.; Patochkina, O. L.; Gritsyna, V. T.
    The reflectance and transmittance spectra for magnesium aluminates spinel single crystals MgO·nAl2O3 and ceramics in the IR spectral range were measured to investigate the nature of vibration modes of constituent ions and incorporated hydrogen. The variation of intensity of registered bands in spinel of stoichiometric and nonstoichiometric compositions and spinel ceramics was obtained and interpreted in terms of vibration modes of divalent and trivalent cations in different coordinations.
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    Radio-luminescence of defects and impurity Ions in magnesium aluminates spinel
    (Видавництво Львівської політехніки, 2012) Gritsyna, V. T.; Kazarinov, Yu. G.; Moskvitin, A. O.
    The investigations of radio-luminescence (RL) in magnesium aluminates spinel crystals at variation of the time, intensity of X-irradiation and temperature of sample were provided. There were registered three prominent RL bands related to electron-hole recombination process at anti-site defects, emission of Mn2+-ions and emission of Cr3+-ions. The kinetics of the growth of indicated RL emissions show the competing processes of the capture of free charge carriers generated at irradiation by intrinsic defects and impurity ions.