The optical spectra and color of chromium containing solids

Abstract The dependence of the ligand field parameter Δ and Racah parameter B on the lattice expansion and nearby crystal field environment is discussed for Cr +3 contained in the solid solutions (Al, Cr) 2 O 3 , (Ga, Cr) 2 O 3 , (Al, Ga, Cr) 2 O 3 , Mg(Al, Cr) 2 O 4 , La(Ga, Cr)O 3 , La(Al, Ga, Cr)O 3 and Y(Al, Cr)O 3 . Tristimulus calculations were made for the chromia-alumina system, and the color change from red to green was elucidated in terms of the chromaticity diagram. The thermochromy or color change that occurs as a function of temperature was shown to be a natural consequence of the lattice expansion that occurs on heating. It is predicted that high chromia content ruby will exhibit a piezochromic effect and change color at high pressure. Thermochromy and piezochromy are believed to be general properties of solids containing Cr +3 ions.

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