Cation distribution in a series of mixed ferrites MgxMn1.1-xSn0.1Fe1.8O4 by means of powder X-ray diffraction and 57Fe, 119Sn Moessbauer spectroscopy.
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概要
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The cation distribution in a series of Mg<I><SUB>x</SUB></I>Mn<SUB>1.1−<I>x</I></SUB>Sn<SUB>0.1</SUB>Fe<SUB>1.8</SUB>O<SUB>4</SUB> spinel ferrites has been studied by means of X-ray powder diffraction and <SUP>57</SUP>Fe, <SUP>119</SUP>Sn Mössbauer spectroscopy. All of these ferrites showed broad <SUP>119</SUP>Sn Mössbauer spectra due to the hyperfine magnetic field from the ferrimagnetically ordered cations at the A and B sites. With increasing <I>x</I> the distribution of the hyperfine field at the Sn atom became broader and the hyperfine field decreased abruptly above <I>x</I>=0.825. This observation indicates that diamagnetic Mg<SUP>2+</SUP> ions are excluded from the A site below <I>x</I>=0.55, but occupy the A site as well as the B site only above <I>x</I>=0.825. This result is consistent with the Rietveld analyses of the X-ray powder diffraction data. The <SUP>119</SUP>Sn Mössbauer spectroscopy is shown to be a useful technique for studying the cation distribution of ternary spinels in which the site preference of cations can not be empirically predicted.
- 公益社団法人 日本化学会の論文
著者
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Sakai Hiroshi
Department Of Agricultural Chemistry The University Of Tokyo
-
Yamada Koji
Deparment Of Food Science And Technology Faculty Of Agriculture Kyushu University
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Ichiba Sumio
Department of Chemistry, Faculty of Science, Hiroshima University
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Ohshita Hiroyuki
Department of Chemistry, Faculty of Science, Hiroshima University
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Funabiki Shinya
Department of Chemistry, Faculty of Science, Hiroshima University
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