Перегляд за автором "Miloslavsky, V. K."

Зараз показано 1 - 6 з 6
  • Зображення мініатюри
    Публікація
    Dispersion of refractive index of thin films CdI2 and ZnI2
    (НТК “Інститут монокристалів” Національної академії наук України, 2010) Kovalenko, E. N.; Miloslavsky, V. K.; Yunakova, O. N.
    A dispersion of refractive index in thin films CdI2 and ZnI2 are measured in the interval of lengths waves 300-1000 nanometers, its processing with the help monooscillator model is in the good agreement with data of experiment. The optical inductivity  of two compounds is determined by retrieved parameters of this model, this optical inductivity are utilised for the further analysis of excitons states in CdI2 and ZnI2, and, in particular, for determination of 1s excitons radius. The retrieved values аех are close to parameters of a unit cell of two compounds, that indicates a fitting of excitons in two compounds to excitons of intermediate electron - hole connection
  • Зображення мініатюри
    Публікація
    Electronic Absorption Spectrum of Thin K2ZnI4 Films
    (2008) Yunakova, O. N.; Miloslavsky, V. K.; Kovalenko, E. N.
    The absorption spectrum of thin K2ZnI4 films has been investigated in the range of 3–6 eV at temperatures from 90 to 340 K. It is established that this compound belongs to direct-gap insulators; low-frequency exciton excitations are localized in the ZnI4 lattice layers and have a quasi-two-dimensional character. The spectral analysis revealed the existence of two K2ZnI4 modifications, which presumably belong to the monoclinic (I) and orthorhombic (II) phases. The temperature dependences of the spectral position and halfwidth of the low-frequency exciton band in K2ZnI4 revealed the existence of first-order phase transitions at 215 and 225 K in the monoclinic and orthorhombic phases, respectively.
  • Зображення мініатюри
    Публікація
    Exciton absorption spectrum of Cs4PbCl6 thin films
    (Institute for Single Crystals, 2015) Yunakova, O. N.; Miloslavsky, V. K.; Kovalenko, E. N.; Kovalenko, V. V.
    The absorption spectrum of thin films Cs4PbCl6 is studied in the spectral range of 2-6 eV within the temperature interval 90-500K. Localization of exciton excitations in the sublattice of the compound containing Pb2+ ions is established. Excitons related to excitons of the intermediate bond and are two-dimensional nature
  • Зображення мініатюри
    Публікація
    Exciton Absorption Spectrum of Thin CsPbI3 and Cs4PbI6 Films
    (2012) Yunakova, O. N.; Miloslavsky, V. K.; Kovalenko, E. N.
    A method for preparing thin films of CsPbI3 and Cs4PbI6 complex compounds has been devel oped. Their absorption spectrum is investigated in the energy range of 2–6 eV at temperatures from 90 to 500 K. It is found that the CsPbI3 compound is unstable and passes to the Cs4PbI6 phase upon heating at T ≥ 400 K.
  • Зображення мініатюри
    Публікація
    Influence of impurities on the absorption spectrum of thin Cs4PbI6 films
    (Institute for Single Crystals, 2014) Yunakova, O. N.; Miloslavsky, V. K.; Kovalenko, E. N.; Kovalenko, V. V.
    The absorption spectrum of the solid solutions (Cs1-xMx)4PbI6 (M=Rb,K) 0х1 is studied in the spectral range 2-6 eV at T = 90K. The formation of solid solutions (Cs1-xRbx)4PbI6 in all range of concentrations is established, the compound К4PbI6 is unstable. Linear concentration of long-wavelength exciton band parameters in the (Cs1-xMx)4PbI6 indicates the localization of excitons in PbI64- structural elements of the compounds crystal lattice
  • Зображення мініатюри
    Публікація
    The Exciton Absorption Spectrum of KPbI3 Thin Films
    (ФТИ им. А.Ф.Иоффе, 2014) Yunakova, O. N.; Miloslavsky, V. K.; Kovalenko, E. N.
    The absorption spectrum of KPbI3 thin films is studied in the spectral range 2–6 eV within the temperature interval 90–470 K. Localization of excitons in the sublattice of the compound containing lead ions is established. Excitons are shown to be of two dimensional nature.