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 1309.    ---------------.  [HÄGG, G.] [Crystal Structure of Magnetic Ferric Oxide, γ-Fe₂O₃.]  Ztschr. Physik. Chem., vol. 29, B, 1935, p. 95-103; Chem. Abs., vol. 29, 1935, p. 6122.

       When Fe₃O₄ is oxidized at low temperature, the spinel structure is retained to form γ-Fe₂O₃ with a steady decrease in the dimension of the elementary cell from 8,380 to 8,322 Å.  Change in intensity of the X-ray patterns and the density indicates that the increase in the O concentration produces empty spaces in the spinel lattice so that in γ-Fe₂O₃, where the O concentration reaches a maximum 1/9 of the original Fe atomic positions are unoccupied, and the elementary cell contains an average of 21 1/3 Fe and 32 O.

       HAHN, D. A.  See abs. 2173.

       HAHN, H., AND MÜHLBERG, H.  [Metal Amides and Metal Nitrides.  XX.  System Iron-Nickel-Nitrogen.]  See abs. 1650.