Magnetic Properties of Several Phases of Barium Orthoferrate, BaFeO_x

概要

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Various barium orthoferrates over wide Fe^<4+> concentrations were prepared and their magnetic properties were investigated. The hexagonal phase with large Fe^<4+> concentration is ferromagnetic above the anomaly point. With increasing Fe^<3+>, it tends to be antiferromagnetic. The cubictetragonal phases are paramagnetic with positive paramagnetic Curie temperature. In these phases, the Fe^<4+>-Fe^4 interaction is ferromagnetic, but the Fe^<3+>-Fe^<4+> and Fe^<3+>-Fe^<3+> interactions are antiferromagnetic. Some of the Fe^<3+> and Fe^<4+> ions in these phases take low spin states due to strong uniaxial crystalline fields caused by neighbouring oxygen vacancies. The triclinic I phase seems to have a magnetic structure of one-dimensional antiferromagnet. The magnetic structures of the triclinic II and rhombohedral phases resemble that of the triclinic I.
社団法人日本物理学会の論文
1970-01-05