1279.    GUILLAUD, C., MICHEL, A., BÉNARD, J. AND FALLOT, M.  [Ferromagnetic Properties of Chromium Dioxide.]  Compt. Rend., vol. 219, 1944, pp. 58-60; Chem. Abs., vol. 40, 1946, p. 2365.

        Ferromagnetic CrO₂ was prepared by heating CrO₂Cl₂.  This gave a mixture of approximately equal parts of CrO₂ and a solid solution of O₂ in Cr₂O₃ corresponding to (8 Cr₂O₃+O).  The exact proportions of the 2 constituents in a particular specimen were deduced from its loss in weight when the whole was converted into Cr₂O₃ by calcining at 900°.  Magnetic studies made of 2 specimens with different CrO₂ contents, prepared independently, are reported as giving concordant results, although no experimental details are given.