Luminescence centers in anhydrite,barite, celestite and their synthesized analogs |
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| Authors: | M L Gaft L V Bershov A R Krasnaya V Ya Yaskolko |
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| Institution: | 1. IGEM Academy of Science of the USSR, Staromonetny 35, 109017, Moscow, USSR
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| Abstract: | The intrinsic luminescence center (LC) of SO 4 2? appears at 360 nm in all types of sulfates, but is absent in sulfates with large quantities of impurities. Three nonequivalent Gd3+ LC have been observed in luminescence spectra of anhydrite. Gd3+, Ce3+ O 2 ? LC were established in celestite. Photoluminescence (PL) bands in the sulfates were assigned as follows: the band at 460 nm is related to Eu2+ (a connection with Al3+ or donor-acceptor pair is possible also) in sulfates of Ca and Ba; bands at 520 nm and 590 nm are related to VO4, MoO4 and TiO4 substituting SO4; the band at 660 nm is assigned to Ti3+ X-ray luminescence (XL) band at 620 nm is assigned to Ag+. |
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