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Growth and characterization of pure and Co2+-doped Li2B4O7 single crystals

✍ Scribed by D. Piwowarska; S. Kaczmarek; M. Berkowski

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
247 KB
Volume
42
Category
Article
ISSN
0232-1300

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✦ Synopsis

Pure and Co-doped Li 2 B 4 O 7 (LBO) single crystals were grown by the Czochralski method. Starting concentrations of Co 2 O 3 in the melt were: 0.5, 0.85 and 1 mol% relative to Li 2 CO 3 . 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 Co 2+ ions enter LBO crystal at octahedral Li + site positions. Low-temperature EPR measurements revealed that two types of Co 2+ complexes can be distinguished in the Li 2 B 4 O 7 :Co crystals. Additional absorption calculated for Ξ³-irradiated crystals showed V k 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 + .

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