高周波誘導熱プラズマによる新化合物, YFe_xO_<1.5(1+x)>(x^〜_=3.5, const.), 微粒子の合成 - 化合物の組成の推定及びYのEr, Ho, Dy, Ndとの置換 -

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We previously reported that ultrafine particles of the Y-Fe-O system (1-100 nm in size) prepared by a radio-frequency thermal plasma process contained a new compound (cubic in crystal system, ferri- or ferromagnetic). Although its crystal structure was not yet clarified in the present study, the composition was estimated to be YFexO1.5(1+x)(x≅3.5, const.) by high accurate lattice constants and Fe/Y of products measured by ICP-ES. The relationship between Fe/Y ratio of precursors and by-product formations and the replacement of Y by each of Er, Ho, Dy and Nd were also examined. The content of hexagonal-YFeO3 (h-YFeO3 : by-product) was found to be minimized at around Fe/Y = 4. Therefore the replacement was performed at this metal ratio because by-product was easily removed. Er, Ho and Dy formed almost a single phase of similar compounds, and their lattice constants could be determined on the basis of the cubic crystal system. Nd, however, resulted in the formation of mixtures of orthorhombic-NdFeO3, α-Fe2O3 and unidentified compounds. Er, Ho and Dy are nearly equal to Y in ionic radius, Whereas Nd is larger than Y, indicating that the rare-earth ions with almost the same size as Y-ion well match the crystal lattice of the new compound.
日本エアロゾル学会の論文
2000-09-20