Manganese agglomeration and radiation damage in doped Li2B4O7

Manganese clustering effects were studied in Li2B4O7 (LTB) ceramics. The samples LTB:Me + Mn (Me = Sn, Cu, Mn, Zn, Be) were prepared by a two-stage doping method (except for LTB doped with Mn solely). EPR, pulsed cathodoluminescence, thermoluminescence (TL) were measured. Mn clustering causes supralinearity of the material response to the radiation dose, reversible shift of the dosimetric TL peak, and irreversible radiation damage. Radiation damage of the LTB crystal lattice is accompanied with the formation of a peroxide bridge instead of a single oxygen at the common vertex of two BO4 tetrahedra. Repelled by an excessive positive charge of a Mn cluster, holes are localized around at traps including the peroxide bridges where they are stable up to 630 K. The extent of the radiation damage can be estimated by the intensity of the high-temperature TL at 630 K, when the released holes recombine with the electrons near regular Mn2+. The most stable against the radiation damage and also suitable for TL dosimetry is LTB:Sn + Mn. © 2019

Danilkin M.I.1 , Koksharov Y.A.2 , Romet I.3 , Seeman V.O.3 , Vereschagina N.Y.1 , Zubov A.I. 1, 4 , Selyukov A.S.1, 5
  • 1 P. N. Lebedev Physical Institute of the Russian Academy of Sciences, Leninskiy Prosp. 53, Moscow, 119991, Russian Federation
  • 2 Faculty of Physics, Lomonosov Moscow State University, Leninskiye Gory 1-2, Moscow, 119991, Russian Federation
  • 3 Physics Institute of the University of Tartu, W. Ostwaldi tn 1, Tartu, 50411, Estonia
  • 4 Faculty of Science, RUDN University, Ordzhonikidze Str. 3, Moscow, 117198, Russian Federation
  • 5 Moscow Institute of Physics and Technology (State University), Institutskií Per. 9, Dolgoprudnyí, Moscow Region, 141700, Russian Federation
Ключевые слова
Dosimetry; EPR; Lithium tetraborate; Mn clustering; Radiation defects; Radiation detectors; Thermoluminescence
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