Synthesis, Crystal Structure, and Magnetic Properties of Quasi-One-Dimensional Oxides Ca3CuMnO6 and Ca3Co1 +xMn1-xO6

Synthesis conditions, crystal structures, and magnetic properties of quasi-one-dimensional complex oxides Ca3CuMnO6 (space group P-1, z=4, triclinic cell) and Ca3Co1+xMn1-xO6 with x=0, 0.25, 1.0 (structural type K4CdCl6, space group R-3c, z=6) are presented. The crystal structures of Ca3CoMnO6 and Ca3CuMnO6 were refined using neutron and combined X-ray and neutron diffraction analysis, respectively. The interatomic distances in oxygen polyhedra were found. In contrast to ferromagnetic Ca3Co2O6 (Tc=24 K), manganese-containing phases Ca3Co1+xMn1-xO6 are characterized by antiferromagnetic interactions with Neel temperatures 18 K (x=0.25) and 13 K (x=0). For Ca3CuMnO6TN was established to be 6 K.