Synthèse et propriétés magnétiques de solutions solides entre l'oxyde de chrome CrO2 et l'oxyhydroxyde de cobalt CoOOH |
| |
Authors: | M. Pernet J.C. Joubert |
| |
Affiliation: | Laboratoire de Rayons X-C.N.R.S. B.P. 166 Centre de Tri, 38042, Grenoble-Cedex, France |
| |
Abstract: | Solid solutions of general formula (1 ? x)CrO2, xCoOOH have been prepared by hydrothermal synthesis under very high pressure conditions (80 kb). Cr6+O3 and CoCr6+O4 were used as starting materials. Homogeneous ferromagnetic phases were obtained when 0 ? x ? 0.5. X ray powder patterns clearly demonstrate the isotype with InOOH, an orthorhombic distorted rutile type structure. The results of the magnetic measures performed on samples with different compositions indicate that part of the Cr4+ cation have been reduced to Cr3+ and that the general formula of the solid solutions should be written Cr4+1?(x+y)Cr3+yCo2+xO2Hx+y. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|