The present Paper describes the results of the quantitative measurement of the intensity of X-ray reflexion from different planes of Fe 3 O 4 . The side of the unit cell=8.400 Å. The parameter, fixing the position of the oxygen atoms, has been determined as x =0.379±0.001. F-curves, representing the dependance of the scattering power of oxygen- and iron-ions on the glancing angle, have been obtained. These F-curves (uncorrected for heat-motion) decline much more strongly than the calculated curves for Stoner's distribution of electrons amongst atomic levels.
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A A Claassen (1925) studied this question.