The Phse Stability and the Electrical Properties of <TEX>$3Bi_2O_3.WO_3$</TEX> Solid Electrolyte

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J. Korean Ceram. Soc. > Volume 32(2); 1995 > Article

Journal of the Korean Ceramic Society 1995;32(2): 248.

$3Bi_2O_3.WO_3$ 고체전해질의 상안정성과 전기적 특성

백현덕, 이윤직¹, 박종욱¹

홍익대학교 무기재료공학과
¹한국과학기술원 전자재료공학과

The Phse Stability and the Electrical Properties of $3Bi_2O_3.WO_3$ Solid Electrolyte

ABSTRACT

The electrical conducton in the sintered 3Bi2O3.WO3 solid electrolyte was investigated by measuring the conductivity and ionic transport number. The electrical conductivity was about three to ten times higher than that of YSZ at temperatures between 300 and 80$0^{circ}C$. D.C. polarization method confirmed that 3Bi2O3.WO3 was predominantly an ionic conductor. Unlike the instability of high conductive fcc phase in the rare-earth oxide-Bi2O3 or Y2O3-Bi2O3 systems at temperature below $700^{circ}C$, fcc phase in the 3Bi2O3.WO3 exhibited no transformation even after annealing over 900 hrs at 600 and $650^{circ}C$. Two samples which had different grain sizes showed almost the same conductivity. This result suggests that the electrical properties of grain and grain boundry were very similar.

Key words: $3Bi_2O_3.WO_3$, Phase stability, Electrical property