Zinātniskie raksti (CFI) / Scientific articles

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Browsing Zinātniskie raksti (CFI) / Scientific articles by Author "Akylbekova, Aiman"

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    Ion track template technique for fabrication of ZnSe2O5 nanocrystals
    (Elsevier B.V., 2020) Akilbekov, Abdirash T.; Akylbekova, Aiman; Usseinov, Abay; Kozlovskiy, A. L.; Baymukhanov, Z.; Giniyatova, Sh G.; Popov, Anatoli I.; Dauletbekova, Alma
    ZnSe2O5 nanocrystals with an orthorhombic structure were synthesized by electrochemical deposition into a-SiO2/n-Si ion track template formed by 200 MeV Xe ion irradiation with the fluence of 107 ions/cm2. The lattice parameters determined by the X-ray diffraction and calculated by the CRYSTAL computer program package are very close to each other. It was shown that ZnSe2O5 has a direct band gap of 2.8 eV at the Γ-point. In addition, the calculated charge distribution and chemical bonds show that the crystal has an ion-covalent nature. The photoluminescence excited by photons at 300 nm has a low intensity arising mainly due to zinc and oxygen vacancies.
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    Ion-Track Template Synthesis and Characterization of ZnSeO3 Nanocrystals
    (MDPI, 2022) Dauletbekova, Alma; Akylbekova, Aiman; Sarsekhan, Gulnaz; Usseinov, Abay; Baimukhanov, Zein; Kozlovskiy, Artem; Vlasukova, Liudmila A.; Komarov, Fadey F.; Popov, Anatoli i.; Akilbekov, Abdirash T.
    ZnSeO3 nanocrystals with an orthorhombic structure were synthesized by electrochemical and chemical deposition into SiO2/Si ion-track template formed by 200 MeV Xe ion irradiation with the fluence of 107 ions/cm2 . The lattice parameters determined by the X-ray diffraction and calculated by the CRYSTAL computer program package are very close to each other. It was found that ZnSeO3 has a direct band gap of 3.8 eV at the Γ-point. The photoluminescence excited by photons at 300 nm has a low intensity, arising mainly due to zinc and oxygen vacancies. Photoluminescence excited by photons with a wavelength of 300 nm has a very low intensity, presumably due to electronic transitions of zinc and oxygen vacancies. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.