Magnetic Properties of Several Phases of Barium Orthoferrate, BaFeO x

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.

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