Manganese agglomeration and radiation damage in doped Li2B4O7статья
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Дата последнего поиска статьи во внешних источниках: 9 октября 2019 г.
Аннотация: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