Phase Formation and Protoniz Conduction of La(Ba)<TEX>$ScO_3$</TEX> Perovskites

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J. Korean Ceram. Soc. > Volume 38(11); 2001 > Article

Journal of the Korean Ceramic Society 2001;38(11): 993.

La(Ba)$ScO_3$계 Perovskite의 생성상 및 Proton 전도

이규형, 김혜림, 김신¹, 이형직², 이홍림

연세대학교 세라믹공학과
¹연세대학교 산업기술연구소
²강릉대학교 세라믹공학과

Phase Formation and Protoniz Conduction of La(Ba)$ScO_3$ Perovskites

ABSTRACT

Phase formation and proton conduction in BaO doped LaSc $O_3$with perovskite structure were studied. L $a_{0.6}$B $a_{0.4}$Sc $O_{2.8}$, viz. 40at% $Ba^{2+}$ ion doped composition, showed a single cubic phase, while the other compositions doped less than 30 at% $Ba^{2+}$ ion showed the cubic phase and the orthorhombic one. Above $650^{circ}C$ oxygen ion conduction was dominant in $N_2$atmosphere and below this temperature proton conduction was observed in wet atmosphere. All compositions were found to be the pure proton conductors below 30$0^{circ}C$. The proton conductivity (bulk) of L $a_{0.6}$B $a_{0.4}$Sc $O_{2.8}$ was higher than those of any other composition.osition.ion.

Key words: Proton conduction, BaO doped $LaScO_3$, Perovskite structure, Bulk conductivity