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  1. No Access

    Article

    Influence of the Intensity of Exciting Radiation on the Luminescent Properties of Nanopowders NaYF4:Yb/Tm

    Intensity of the bands of upconversion luminescence of β-NaYF4:Yb3+/Tm3+ nanopowders in DMSO suspensions vs intensity of exciting radiation were analyzed. Ranges of changes in the intensity of excitation have bee...

    S. A Burikov, E. A. Filippova, A. A. Fedyanina, S. V. Kuznetsov… in Optics and Spectroscopy (2023)

  2. No Access

    Article

    Electrical Conductivity of Sodium Sulfate-Based Phases

    We have synthesized and investigated sodium sulfate-based materials with Na+ ion conductivity: Na2SO4, Na2SO4:3.5% Yb, and Na3Ga(SO4)3. The addition of Yb3+ heterovalent cations leads to a considerable increase i...

    N. I. Sorokin, V. Yu. Proydakova, V. V. Voronov, S. V. Kuznetsov… in Inorganic Materials (2022)

  3. No Access

    Article

    Sodium Sulfate Polymorphism

    The crystal structure of anhydrous sodium sulfate purified by double recrystallization from an aqueous solution was investigated by thermal analysis and X-ray phase analysis in the temperature range from 25°C ...

    V. Yu. Proydakova, V. V. Voronov, A. A. Pynenkov… in Russian Journal of Inorganic Chemistry (2022)

  4. No Access

    Article

    Synthesis of Calcium and Strontium Fluorides Using Li2SO4–Na2SO4 Eutectic Melts

    Calcium fluoride and strontium fluoride powders were prepared from respective alkaline-earth metal sulfates by a chemical reaction carried out in molten salt flux made up of lithium and sodium sulfates at 700°...

    V. Yu. Proydakova, A. A. Alexandrov… in Russian Journal of Inorganic Chemistry (2020)

  5. No Access

    Article

    Determining the Photophysical Parameters of NaGdF4:Eu Solid Solutions in Suspensions Using the Judd—Ofelt Theory

    The lifetime of the excited state of new NaGdF4:Eu solid solutions in dimethyl sulfoxide suspensions is determined using the Judd-Ofelt theory. A comparative analysis of the experimental and theoretical values of...

    S. A. Burikov, O. D. Kotova, O. E. Sarmanova, S. V. Kuznetsov… in JETP Letters (2020)

  6. No Access

    Article

    Synthesis and Luminescence of Sr1– x – yYbxEuyF2+ x + y Solid Solutions for Photonics

    Single-phase Sr1– x – yYbxEuyF2+ x + y solid solutions with an average particle size near 90 nm have been synthesized via co-precipitation from aqueous solutions, followed by high-temperature annealing. Efficient...

    S. V. Kuznetsov, A. S. Nizamutdinov, V. Yu. Proydakova… in Inorganic Materials (2019)

  7. No Access

    Article

    Upconversion Luminescence of Fluoride Phosphors SrF2:Er,Yb under Laser Excitation at 1.5 μm

    Upconversion luminescence of fluoride phosphors SrF2:Er,Yb co-precipitated from aqueous solutions is studied. Under excitation of Er3+ ions to the 4I13/2 level, upconversion luminescence spectra are recorded in t...

    A. A. Lyapin, P. A. Ryabochkina, S. V. Gushchin, S. V. Kuznetsov… in Optics and Spectroscopy (2018)