XAFS, 中性子回折, X線異常分散によるCo2Z型Baフェライトの磁性イオン分布の解析

概要

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X-ray absorption fine structure (XAFS), neutron diffraction and anomalous X-ray scattering at Fe-K edge experiments were performed to determine site distribution of iron and cobalt irons in Co2Z-type barium ferrite (Ba3Co2Fe24O41). The atomic coordinates and structure parameters of Ba3Co2Fe24O41 obtained from Rietveld analysis of neutron diffraction well agreed with those of anomalous X-ray scattering. The valences of iron and cobalt ions determined from the results of X-ray absorption near edge structure (XANES) were consistent with the magnitudes of magnetic moments of iron and cobalt ions estimated from the Rietvelt analysis of neutron diffraction. The site occupancy of cobalt ion evaluated from extended X-ray absorption fine structure (EXAFS) analysis at Co-K edge coincides that of the results of neutron diffraction analysis. These facts compensated for the certainty of the respective studies and showed that these experimental techniques were valid for the structural analysis of a material containing elements to which atomic number were adjacent.