STRUCTURE AND PROPERTIES OF Li2-2xMg2+x(MoO4)3 CRYSTALS ACTIVATED BY COPPER IONS
A. A. Ryadun, V. A. Trifonov, V. A. Nadolinny, A. A. Pavlyuk, M. I. Rakhmanova
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: ЭПР ионов переходных металлов, люминесценция, сцинтилляторы, кристаллы двойного молибдата, EPR of transition metal ions, luminescence, scintillators, crystals of double molybdate
Abstract
By the low-gradient Čzochralski method, both undoped and copper ion activated Li2-2 xMg2+ x(MoO4)3 crystals are grown. The charge state and structural position of impurity copper ions are determined using EPR. Investigations of the luminescence properties reveal that luminescence with a maximum at λ = 520 nm is observed for Li2-2 xMg2+ x(MoO4)3 crystals. A decrease in the temperature increases the intensity of this luminescence. It is found that the doping of Li2-2 xMg2+ x(MoO4)3 crystals with copper ions also increases the luminescence intensity with a maximum at λ = 520 nm. It is supposed that cation vacancies, which provide the charge compensation when copper ions substitute for lithium ions, are responsible for the luminescence.
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