Na_<3+3x-y>Y_<1-x>P_ySi_<3-y>O_9組成を持つナトリウムイットリウムケイリン酸塩セラミックスの合成法と結晶相及びナトリウムイオン伝導度

概要

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Three kinds of new fast Na^+_conductors were obtained in the system Na_2O-Y_2O_3-SiO_2-P_2O_5. These compounds are isostructural with the mother silicate Na_3 YSi_3O_9, Na_5YSi_4O_<12> or Na_9YSi_<16>O_<18>. They were synthesized according to the composition Na_<3+3x-y>Y_<1-x>P_ySi_<3-y>O_9. The ionic conductivity and activation energy of these materials were found to strongly depend on the type of phase and composition : 10^<-6>S/cm<σ_<388><10^<-1>S/cm and 20 kJ/mol<E<88 kJ/mol. Among them, Na_5YSi_4O_<12>-type compounds were superior to the other in Na^+ conductivity : 10^<-2>S/cm< σ_<388><10^<-1>S/cm. Based on the simple models proposed for explaining the conduction mechanisms, the effect of substitution of PO_4 and Na^+ for SiO_4 and Y^<3+> on the conduction properties has been discussed.
社団法人日本セラミックス協会の論文
1988-10-01