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Growing Large Size Complex Oxide Single Crystals by Czochralski Technique for Electronic Devices

100%
Solskii I., Sugak D., Vakiv M.
Acta Physica Polonica A
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2013
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vol. 124
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issue 2
314-320
EN
This paper is devoted to the use and further development of the single crystal growing technique invented by Professor Jan Czochralski (1885-1953). The possibilities of the Czochralski technique are demonstrated. Further improvements were introduced at the Scientific Research Company "Carat" (Lviv, Ukraine) to grow large size complex oxide single crystals. The paper presents an overview of some single crystals grown with the use of a modified technology. Growth parameters and properties of resulting crystals are summarized to show a high potential of the Czochralski technique as an industrial technology to grow large-size, high quality, and structurally perfect single crystals of complex oxides.
2
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NMR Analysis of Mg Ion Localization in LiNbO_{3} Crystal

100%
Yatsenko A., Yevdokimov S., Sugak D., Solskii I.
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EN
The analysis of cation sublattices population in magnesium doped LiNbO_{3} crystals is carried out. It is shown that volume concentration of lithium vacancies (V_{Li}) monotonously increases with increasing of MgO content in the crystal up to the threshold value. A series of LiNbO_{3} crystals with various concentration of Mg^{2+} were investigated by ^{7}Li and ^{93}Nb Nuclear Magnetic Resonance (NMR). It is concluded that the peculiarities of NMR spectra in Mg-doped LiNbO_{3} crystals can be explained by the formation of defect complexes including Mg_{Li} ions and V_{Li} on the shortest distances between them.
3
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In situ Investigation of OH^{-} Absorption in LiNbO_{3} and LiNbO_{3}:MgO Crystals during Reducing/Oxidizing Annealing

76%
Sugak Y., Sugak D., Zhydachevskii Y., Solskii I., Buryy O., Ubizskii S., Becker K.
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EN
The work presents experimental results of an in situ investigation of the OH^{-} absorption in pure and MgO-doped LiNbO_{3} crystals during reducing (95% Ar + 5% H_{2}) and oxidizing (O_{2}) high-temperature treatments in the temperature range from room temperature to 820 K. The absorption spectra measured in situ at high temperatures in reducing/oxidizing atmospheres have been analyzed. The origin of the changes in optical absorption caused by heating of the crystal is discussed in terms of the OH-bonds orientation change.
4
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Influence of the γ-Radiation on the Generation Characteristics of the YAlO_{3}:Nd Crystals

64%
Sugak D., Matkovskii A., Grabovskii V., Prokhorenko V., Suchocki A., Durygin A., Solskii I., Shakhov A.
Acta Physica Polonica A
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1998
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vol. 93
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issue 4
643-648
EN
The results of investigation of the influence of γ-radiation by ^{60}Co-source on the YAlO_{3}:Nd laser generation characteristics are presented in this paper. The significant decrease in the output energy after γ-irradiation was obtained. The energetic characteristics are restored after illumination of the γ-irradiated laser rods by 1000-10000 pulses of the pumping lamp light. The additional absorption spectrum is induced by γ-irradiation in the crystals. The nature of the created in this way colour centres is discussed. The mechanism of influence of the colour centres on generation properties of the crystals is discussed.
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