The Effect of <TEX>$Ba^{2+}$</TEX>ion Dissolution on Microstructural Changes and Electrical Properties in <TEX>$BaTiO_3$</TEX> Aqueous Slurry System

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J. Korean Ceram. Soc. > Volume 37(5); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(5): 511.

나노 $BaTiO_3$ 수계슬러리에서 미세구조 및 전기적 특성에 미치는 $Ba^{2+}$이온 용출의 영향

김상우, 신용욱¹, 이해원, 윤기현¹

한국과학기술연구원 세라믹공정연구센터
¹연세대학교 세라믹공학과

The Effect of $Ba^{2+}$ion Dissolution on Microstructural Changes and Electrical Properties in $BaTiO_3$ Aqueous Slurry System

ABSTRACT

The effect of Ba2+ ion dissolution with different pH and amount of PAA on microstructural changes of green and sintered bodies and its electrical properties was studied in aqueous nano-size BaTiO3 slurry system. The dissolution of Ba2+ was least at strong base, pH 10.8 and by addition of amount of 0.15 wt% PAA. The green body with the lowest of dissolution of Ba2+ at pH 10.8 and 0.15 wt% PAA had minimum values of average pore size, 40nm and shown high increase of sintered density. The compact sintered at 125$0^{circ}C$ for 2 hr with highest Ba2+ dissolution had low density and dielectric constant due to abnormal grian growth. However, the sintered body with the lowest Ba2+ dissolution had high sintered density and then shown high dielectric constant.

Key words: Aqeous $BaTiO_3$, PAA, $Ba^{2+}$ dissolution, pH, Dielectric constant