Abstract
AbstractPure and Co‐doped Li2B4O7 (LBO) single crystals were grown by the Czochralski method. Starting concentrations of Co2O3 in the melt were: 0.5, 0.85 and 1 mol% relative to Li2CO3. Technological factors affecting the quality of both crystals were discussed. Optical absorption and EPR spectra were analyzed to define the oxidation states and lattice sites of cobalt ions. It was shown that Co2+ ions enter LBO crystal at octahedral Li+ site positions. Low‐temperature EPR measurements revealed that two types of Co2+ complexes can be distinguished in the Li2B4O7:Co crystals. Additional absorption calculated for γ‐irradiated crystals showed Vk type defects suggesting the creation of cation vacancies during growth. The concentration of the defects decreases with an increase of intentional Co concentration. Introduction of cobalt ions to LBO crystal is limited probably by the formation of cobalt ion pairs or by the entrance of cobalt as Co+. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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