Synthesis of Corundum Doped with Cerium in Supercritical Water Fluid

Maryashkin, A.V.; Ivakin, Y.D.; Danchevskaya, M.N.; Murav’eva, G.P.; Kirikova, M.N.

Авторы: Maryashkin A.V., Ivakin Yu D., Danchevskaya M.N., Murav’eva G.P., Kirikova M.N.
Журнал: Moscow University Chemistry Bulletin
Том: 66
Номер: 5
Год издания: 2011
Издательство: Allerton Press Inc.
Местоположение издательства: United States
Первая страница: 290
Последняя страница: 298
Аннотация: 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 P(H2O) = 21–31 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 trans formation 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 αAl2O3 : 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 followup 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 super critical water fluid upon the synthesis of boehmite and corundum. Exposure to high temperatures causes their transformation.
Добавил в систему: Ивакин Юрий Дмитриевич

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