Synthesis,Crystal Structure,and Magnetic Properties of Quasi-One-Dimensional Oxides Ca_3CuMnO_6 and Ca_3Co_(1+x)Mn_(1-x)O_6

摘要

Synthesis conditions,crystal structures,and magnetic properties of quasi-one-dimensional complex oxides Ca_3CuMnO_6(space group P-1,z=4,triclinic cell) and Ca_3Co_(1+x)Mn_(1-x)O_6 with x=0,0.25,1.0(structural type K_4CdCl_6,space group R-3c,z=6) are presented.The crystal structures of Ca_3CoMnO_6 and Ca_3CuMnO_6 were refined using neutron and combined X-ray and neutron diffraction analysis,respectively.The interatomic distan-ces in oxygen polyhedra were found.In contrast to ferro-magnetic Ca_3Co_2O_6(T_c=24K),manganese-containing phases Ca_3Co_(1+x)Mn_(1-x)O_6 are characterized by antiferromagnetic inter-actions with Neel temperatures 18K(x=0.25) and 13K (x=o).For Ca_3CuMnO_6 T_N was established to be 6K.