Abstract
The magnetic susceptibilities of ruby samples (Cr3+ in α-Al2O3) were measured before and after Co60 γ irradiation. Within the experimental error the magnetic susceptibility was found to be unchanged by the irradiation. The degree of microwave saturation possible for the Cr3+ spin system, when at the resonance condition for complete saturation, showed a marked decrease after irradiation. Together, these results indicate that the γ irradiation has changed the resonance condition for approximately 10–15% of the Cr3+ in a 0.05 wt% Cr2O3 sample. A likely inference is that the oxidation state of at least 99% of the chromium is unaltered, and that less than 10 ppm Cr has valence differing from three in the irradiated sample. These experiments are in essential agreement with other experiments on ruby.
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