Abstract
Z-type hexagonal barium ferrite samples in which a part and/or all of Ba2+ was substituted for Sr2+ were prepared by the ceramic method, Ba3Co2Fe24O41, Ba1.5Sr1.5Co2Fe24O41 and Sr3Co2Fe24O41. The Sr2+ substitution was found favorable for lowering temperature and oxygen partial pressure in the sintering process. Ba1.5Sr1.5Co2Fe24O41 and Sr3Co2Fe24O41 were obtained at 1523K under Po2=101.3kPa and at 1483K under Po2=21.3kPa, respectively. We investigated crystal and magnetic anisotropies of the materials by measuring the magnetizations and XRD patterns of specimens which were shaped by pressing the sample powders in a magnetic field. Both the results indicated that the magnetic moment lay in the basal plane of the hexagonal structure in Ba3Co2Fe24O41 and Ba1.5Sr1.5Co2Fe24O41, whilst was significantly off from the basal plane in of Sr3Co2Fe24O41. We measured their powder neutron diffraction patterns and analyzed them by the Rietveld method to estimate site distributions of Sr2+-Ba2+ and Fe3+-Co2+, and orientation of the magnetic moment. The analyses revealed (1) Sr2+ preferentially occupied a site out of two sites available for Ba2+, (2) the magnetic cation distribution in Sr3Co2Fe24O41 was significantly different from those of the others, and (3) the magnetic moment angle with respect to the c-axis was 52.3° in Sr3Co2Fe24O41 whilst almost 90° in the others.
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