Abstract
Polycrystalline α-phase Al 2O 3Cr 2O 3 solid solutions containing 0.01–4.98% Cr have been examined using electron spin resonance (ESR) and optical fluorescence techniques. The KU-band ESR spectrum of isolated Cr 3+ ions in the α-phase material is quantitatively explained using perturbation theory. Arguments against a previous explanation of one of the resonance lines from coupled Cr 3+ ions are given. The absence of sharp line fluorescence in the presence of the relatively narrow ESR line at g = 1.98 in the γ-phase material is further evidence for its assignment to Cr 5+ ions as opposed to Cr 3+ ions. Two new fluorescent lines are observed when the γ-phase and α-phase coexist and possible explanations are given.
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