Abstract
We report for the first time synthesis of Al2-xCrxO3 solid solutions by a newly developed cryosol method. The essence of the method is the treatment of an aqueous solution containing chromium and aluminum nitrates by an anion-exchange resin in the OH- form producing hydroxide sols. The freeze-drying of these sols results in hydroxide precursors, and their further annealing yields finally solid solutions. It is shown that the application of the crysol method enables the synthesis of single-phase ruby powders containing 7 mol % Cr at relatively low annealing temperatures (T = 950 °C) and times (2.5 h). Also, we investigated the influence of the organization of the initial colloid system on the properties of final Al2-xCrxO3 solid solutions. The data are used for the refinement of the sub-solidus part of the Al2O3−Cr2O3 phase diagram.
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