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  1. No Access

    Article

    Charge Transfer and F-Type Centers in Alkaline-Earth Fluorides Activated by Cd2+ or Zn2+ Ions

    Photoluminescence spectra of impurity centers containing anion vacancy Cd+ \({{{v}}_{a}}\) or Zn+ \({{{v}}_{a}}\) in alkali-earth fluorides have been studied. A comparison with luminescence spectra of photoch...

    A. V. Egranov, R. Yu. Shendrik, T. Yu. Sizova in Optics and Spectroscopy (2020)

  2. No Access

    Article

    Are the Photochromic Centers in Alkaline-Earth Fluorides Analogous to DX Centers in Semiconductors?

    It is shown the photochromic PC centers that form during the radiative coloration of alkaline-earth fluoride crystals doped with a number of rare-earth ions (La, Ce, Gd, Tb, Lu, and Y) can be attributed to DX-...

    A. V. Egranov, R. Yu. Shendrik… in Bulletin of the Russian Academy of Science… (2019)

  3. No Access

    Article

    Onset Temperatures and Kinetics of Quartz Glass Crystallization

    A complex analysis of the crystallization of quartz glass from quartzites of the Bural-Sardyk deposit (the Eastern Sayan) has been performed. A mineralogical and petrographic characterization of the quartzites...

    A. I. Nepomnyashchikh, A. A. Shalaev, T. Yu. Sizova… in Crystallography Reports (2018)

  4. No Access

    Article

    Optical Glass Based on the East Sayan Mountain Quartzites

    Four types of high-purity quartzites from the Oka–Urik block, stock quartzites of the East Sayan Urengenur block, and granular quartz of the Patom plateau (vein 2821) are investigated. The textural and structu...

    A. I. Nepomnyashchikh, M. G. Volkova, A. P. Zhaboedov… in Glass Physics and Chemistry (2018)

  5. No Access

    Article

    Instability of monovalent ions of transitional metals in alkaline earth fluorides: CaF2 and SrF2 activated by Co2+ or Ni2+

    The ground state of monovalent ions of transitional metals in alkaline-earth fluorides is localized in the conduction band. It is shown by the example of monovalent Co and Ni ions in CaF2 and SrF2 crystals that t...

    A. V. Egranov, T. Yu. Sizova… in Bulletin of the Russian Academy of Science… (2017)

  6. No Access

    Article

    Divalent rare-earth ions Pr, Sm, Нo, Er, Tm, and Yb in crystals of alkaline-earth fluorides

    The absorption spectra of radiation-colored CaF2, SrF2, and BaF2 crystals activated by trivalent Pr, Sm, Нo, Er, Tm, and Yb (rare-earth, RE) ions are studied. It is shown that ionizing radiation reduces the impur...

    T. Yu. Sizova, V. Yu. Veslopolova… in Bulletin of the Russian Academy of Science… (2017)

  7. No Access

    Article

    Effect of cationic impurities on the formation of radiation defects in alkaline earth fluorides

    A new model of photochromic centers formed by ionizing radiation or the additive coloration of alkaline earth fluorides doped with rare-earth ions (La, Ce, Gd, Tb, Lu, and Y) is proposed, based on original exp...

    A. V. Egranov, T. Yu. Sizova… in Bulletin of the Russian Academy of Science… (2015)

  8. No Access

    Article

    Effect of γ-radiation in the quality of high-molecular sulfite cellulose

    The effect of ionizing radiation on the molecular weight characteristics and ability to be dissolved of high-molecular, high-viscosity sulfite cellulose has been investigated.

    A. N. Sokira, T. P. Belasheva, T. Yu. Sizova, L. I. Barsova… in Fibre Chemistry (1988)