Abstract
The properties of fine crystalline corundum doped with cerium (α-Al2O3: Ce3+) during synthesis in a supercritical fluid have been studied. The synthesis of corundum has been carried out by the thermal treatment of hydrargillite, Al(OH)3, at T = 415°C and {ie290-1} MPa in reaction media that contained from 0.001 to 0.25 wt % of cerium. Cerium ions are incorporated into the boehmite lattice during the transformation of hydrargillite into boehmite, which forms fine monocrystals of the doped corundum with a size from 20 to 50 μm. The size of the corundum crystals increases with increasing pressure and increasing concentration of cerium. The synthesized α-Al2O3: Ce3+ reveals a luminescent band in the UV region at 352 nm and a blue band at 421 nm. The intensity of the cerium ion luminescence in corundum increases with an increase in the water fluid pressure during synthesis. The follow-up annealing of α-Al2O3: Ce3+ at 1400°C in a vacuum leads to a decrease in the luminescence. It has been concluded that spectrally active complex structures that include cerium ions, oxygen vacancies, and hydroxyl groups are produced in the media of a supercritical water fluid upon the synthesis of boehmite and corundum. Exposure to high temperatures causes their transformation.
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Original Russian Text © A.V. Maryashkin, Yu.D. Ivakin, M.N. Danchevskaya, G.P. Murav’eva, M.N. Kirikova, 2011, published in Vestnik Moskovskogo Universiteta. Khimiya, 2011, No. 5, pp. 352–362.
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Maryashkin, A.V., Ivakin, Y.D., Danchevskaya, M.N. et al. Synthesis of corundum doped with cerium in supercritical water fluid. Moscow Univ. Chem. Bull. 66, 290–298 (2011). https://doi.org/10.3103/S0027131411050087
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DOI: https://doi.org/10.3103/S0027131411050087