Formation Rate of Tetragonal BaTiO<sub>3</sub> Powder by Hydrothermal Synthesis and its Dielectric Property

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doi:2002.39.7.628

J. Korean Ceram. Soc. > Volume 39(7); 2002 > Article

Journal of the Korean Ceramic Society 2002;39(7): 628.
doi: https://doi.org/10.4191/kcers.2002.39.7.628

수열합성법에 의한 정방정 BaTiO₃ 분말의 생성속도 및 유전특성

이종현, 최용각, 원창환, 김채성¹

충남대학교 급속응고 신소재연구소
¹공주대학교 화학과

Formation Rate of Tetragonal BaTiO₃ Powder by Hydrothermal Synthesis and its Dielectric Property

ABSTRACT

Formation rate of tetragonal BaTiO$_3$powder by hydrothermal synthesis and its dielectric property were studied. Submicron tetragonal BaTiO$_3$ powders were prepared hydrothermally, using Ba(OH)$_2$.8$H_2O$, TiO$_2$(anatase) and KOH as starting chemicals. Characterization via X-ray diffractometry, field emission scanning electron microscopy confirmed that increasing calcination temperatures(from 1100 to 130$0^{circ}C$) promotes the formation of tetragonal BaTiO$_3$. Tetragonal BaTiO$_3$ ceramics, obtained by calcining at 1200 for 3 h after hydrothermal synthesis at 200 for 168 h, exhibited submicron size of 0.5 ~ 0.7 ${mu}{textrm}{m}$ and high relative permittivity.

Key words: Tetragonal $BaTiO_3$, Hydrothermal synthesis, Calcination