Abstract
The chemical shift in stoichiometric and nonstoichiometric α-Cr 2O 3 was determined from the X-ray absorption Cr K edge spectra. The difference in the chemical shifts is produced by the decrease in the valence charge of chromium in the nonstoichiometric compound. Measurements of the temperature dependence of the reciprocal susceptibility between 100 and 1200 K show an antiferromagnetic behaviour for both compounds, with the Néel temperature at 318 K. A big difference in the paramagnetic region was revealed for the compounds investigated. For both compounds, between 318 and 530 K the magnetic susceptibility obeys the Curie-Weiss law, with an effective magnetic moment per chromium ion of 4.86 μ B, very close to the calculated value of 4.9 μ B/Cr 2+). For the stoichiometric compound, over 530 K, the slope of the Curie-Weiss line increases and the effective magnetic moment is 3.83 μ B, very close to the calculated value of 3.8 μ B/Cr 3+.
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