Color shift in Al<sub>2</sub>O<sub>3</sub>.<em>x</em>Cr<sub>2</sub>O<sub>3 </sub>solid solutions and the electroneutrality principle

Physical Review B 79, 241106 (2009)

Color shift in Al2O3.xCr2O3 solid solutions and the electroneutrality principle

J.M García-Lastra, M.T. Barriuso, J.A. Aramburu, M.Moreno

Although the series of Al2O3. xCr2O3 compounds is a model system among mixed crystals the actual origin of the progressive color change from red to green upon increasing the chromium content is not clarified yet. It is shown in this work that such a color shift for x < 0.2 mainly comes from the reduction of the internal electric field, experienced by the CrO69- complex, due to the progressive replacement of a close Al3+ ion by Cr3+ as a result of the electroneutrality principle. The proposed model accounts for the color shift along the whole series.

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