Rb_2O-Fe_2O_3,Cs_2O-Fe_2O_3系におけるβ-,β''-及びβ'''-アルミナ型フェライトの生成とβ,β''相のイオン導電性

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The formation and ionic conductivity of β-, β''-and β'''-alumina type ferrites in the systems Rb_2O-Fe_2O_3 and Cs_2O-Fe_2O_3 were studied. Rb^+ -β-ferrite was formed by heating powder mixtures of Rb_2CO_3・(6-6.5) a -Fe_2O_3 above 1200℃, while Rb^+- β''-ferrite was synthesized together with the β phase below 1150℃. Rb^+- β'''-ferrite was obtained at 1400℃ from Rb_2CO_3・10 a -Fe_2O_3. When the mixtures of Cs_2CO_3・(6-6.5) a -Fe_2O_3 and Cs_2CO_3・10 a -Fe_2O_3 were heated at 1000° and 1400℃, respectively, Cs^+-β- and Cs^+ -β'''-ferrites were formed However the β''phase was not obtained from Cs_2CO_3 and a -Fe_2O_3. Single phase Rb^+-β''- and Cs^+- β"-ferrites were obtained by heating the mixtures of Rb_2CO_3・3Fe_3O_4 and Cs_2CO_3・Fe_3O_4 at 950°-1000℃ in air respectively The β"-ferrites transformed to p phase at 1050°-1150℃. The lattice constants c_0 of M^+-β-, β"- and β'''-ferrites (M^+ : K^+, Rb^+ and Cs^+) increased with increasing size of M^+ ion. The β- and β'''-ferrites were mixed conductors of ion and electron. Rb^+-and Cs^+-β''-ferrites have higher ionic conductivities than the respective β phases. The ionic conductivities are higher than those of other Rb^+ and Cs^+ conductors.
社団法人日本セラミックス協会の論文
1988-02-01