Перегляд за автором "Kovalenko, V. V."

Зараз показано 1 - 3 з 3
  • Зображення мініатюри
    Публікація
    Exciton absorption spectra of KPb2Br5 thin films
    (Institute for Single Crystals, 2016) Kovalenko, E. N.; Kovalenko, V. V.; Yunakova, O. N.; Yunakov, N. N.
    The absorption spectrum of KPb2Br5 thin film of tetragonal (I) and monoclinic (II) structures were investigated in the spectral region of 2-6 eV and the temperature range 90-440K. It was found that KPb2Br5 (I) of the tetragonal structure irreversibly becomes in KPb2Br5(II) of the monoclinic structure when T = 293 K. It is found that low-frequency exciton excitations of KPb2Br5 (I, II) are localized in the sublattice, which contains ions Pb2+, and its are two-dimensional nature.
  • 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
    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