多核錯体Ln[Fe_xCo_<1-x>(CN)_6]・4H_2O(Ln=Pr〜Yb)の熱分解によるペロブスカイト酸化物の作製

概要

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Heteronuclear complexes of Ln[Fe_xCo_<1-x>(CN)_6]・4H_2O (Ln=Pr-Yb) were synthesized and their thermal decomposition products were investigated. Thermal decomposition of the complexes results in the formation of perovskite-type oxides for Ln=Pr-Gd even at 800℃. The lattice parameters, a-, b- and c-lattice constants (crystal system: orthorhombic) increase linearly with the ratio of Fe/Co for the perovskite-type oxide. For Ln=Dy through Yb, the Ln_2O_3 phase is observed as the major product for x=0, but its content decreased with an increase in the Fe content; however, a single phase of the perovskite-type oxide was not formed for x=1. The perovskite-type structure for the Fe systems is easier to form compared with the Co systems. We clarified that the formation of the perovskite-type oxide is mainly affected by the ionic radius of the Ln^<3+> ion and the T^<3+> ion (T=Fe or Co).
社団法人日本セラミックス協会の論文
1997-11-01