Просмотр Zinātniskie raksti (CFI) / Scientific articles по автору "Fedotovs, Andris"

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    • Application of Calcium Aluminate Doped with Mn and Cr in Optical Thermometry 

      Rogulis, Uldis; Fedotovs, Andris; Rodionovs, Pavels; Kemere, Meldra; Antuzevics, Andris; Sarakovskis, Anatolijs; Alps, K.; Kiseleva, V. (Sciendo, 2023)
      Optical thermometers are advantageous for temperature measurement in electromagnetic fields and aggressive environments; however, their composition mostly relies on materials doped with expensive and resource-limited rare ...

    • Crystalline phase detection in glass ceramics by EPR spectroscopy 

      Antuzevics, Andris; Rogulis, Uldis; Fedotovs, Andris; Popov, Anatoli I. (AIP Publishing, 2018)
      The advances of EPR spectroscopy for the detection of activators as well as determining their local structure in the crystalline phase of glass ceramics is considered. The feasibility of d-element (Mn2+, Cu2+) and f-element ...

    • Optical detection of paramagnetic centres in activated oxyfluoride glass-ceramics 

      Rogulis, Uldis T.; Fedotovs, Andris; Antuzevics, Andris; Berzins, Dzintars; Zhydachevskyy, Yaroslav; Sugak, D. (Polish Academy of Sciences, 2018)
      Electron paramagnetic resonance (EPR), magnetic circular dichroism (MCD) and EPR detected via MCD (MCD-EPR) investigations have been performed on rare-earth activated oxyfluoride glasses and glass-ceramics. Er3+, Gd3+, and ...

    • Oxidation State and Local Structure of Chromium Ions in LaOCl 

      Antuzevics, Andris; Krieke, Guna; Ozols, Haralds; Fedotovs, Andris; Sarakovskis, Anatolijs; Kuzmin, Alexei (MDPI, 2021)
      LaOCl doped with 0–10 mol% Cr was synthesized by thermal decomposition of chlorides. X-ray diffraction (XRD) analysis revealed that incorporation of chromium results in a decrease of the lattice parameter a and a simultaneous ...

    • Recombination luminescence of X-ray induced paramagnetic defects in BaY2F8 

      Antuzevics, Andris; Fedotovs, Andris; Berzins, Dzintars; Rogulis, Uldis; Auzins, Krisjanis; Zolotarjovs, Aleksejs; Baldochi, Sonia Licia (Elsevier B.V.Journal of Luminescence, 2020)
      Recombination luminescence (RL) and RL-detected electron paramagnetic resonance (RL-EPR) in BaY2F8 single crystal has been investigated after irradiation with X-rays at low temperature. The recombination process, which ...

    • Shortwave Ultraviolet Persistent Luminescence of Sr2MgSi2O7: Pr3+ 

      Antuzevics, Andris; Doke, Guna; Krieke, Guna; Rodionovs, Pavels; Nilova, Dace; Cirulis, Jekabs; Fedotovs, Andris; Rogulis, Uldis (MDPI, 2023)
      Currently, extensive research activities are devoted to developing persistent phosphors which extend beyond the visible range. In some emerging applications, long-lasting emission of high-energy photons is required; however, ...