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.