Počet záznamů: 1

Electron spin resonance investigation of undoped and Li-doped CdWO.sub.4./sub. scintillator crystals

  1. 1.
    0364035 - FZU-D 2012 RIV DE eng J - Článek v odborném periodiku
    Buryi, Maksym - Laguta, Valentyn - Hybler, Jiří - Nikl, Martin - Rosa, Jan
    Electron spin resonance investigation of undoped and Li-doped CdWO4 scintillator crystals.
    Physica Status Solidi B-Basic Solid State Physics. Roč. 248, č. 4 (2011), s. 993-996 ISSN 0370-1972
    Grant CEP: GA AV ČR IAA100100810
    Výzkumný záměr: CEZ:AV0Z10100521
    Klíčová slova: defects * electron spin resonance * scintillators * wolframite
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 1.316, rok: 2011

    Electron spin resonance spectra were studied in the nominally pure and 0.05% Li-doped single crystals of CdWO4. The measurements revealed the presence of Fe3+ ions in the undoped crystal and Mn2+ ions in the Li-doped crystal with concentrations of about 20-70 ppm. The zero-field splitting parameters are determined with a high precision for both accidental impurities: (i) Fe3+: b0 2 = -0.7567(10) cm-1, b2 2 = - 0.3150(10) cm-1 and (ii) Mn2+: b0 2 = -0.1799 (10) cm-1, b2 2 = 0.1445(20) cm-1. They are in a good agreement with the early data for Mn2+ but differ by about 5% in the case of Fe3+ . We have found that the Li+ doping essentially influences the charge balance in the lattice. The results suggest that the Li doping restores the ionic charges of iron and manganese to 2+, conventional for CdWO4 lattice, diminishing thus their participiation in photoinduced processes.
    Trvalý link: http://hdl.handle.net/11104/0199620