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J. Korean Ceram. Soc. > Volume 35(11); 1998 > Article
Journal of the Korean Ceramic Society 1998;35(11): 1130.
$Bi_4Ti_3O_{12}{cdot}nBaTiO_3(n=1&2)$ 박막에서 $Bi_4Ti_3O_{12}$ 에 대한 $BaTiO_3$의 복합효과
신정묵, 고태경
인하대학교 공과대학 무기재료공학과
The Complexing Effect of $BaTiO_3;for;Bi_4Ti_3O_{12}$ on Layered Perovskite $Bi_4Ti_3O_{12}{cdot}nBaTiO_3(n=1&2)$ Thin Films
ABSTRACT
Thin films of $Bi_4Ti_3O_{12};nBaTiO_3(n=1&2)$ were prepared using sols erived Ba-Bi-Ti complex alkoxides. The sols were spin-cast onto $Pt/Ti/SiO_2/Si$ substrates and followed by pyrolysis for 1 hr at $620^{circ}C,;700^{circ}C;and;750^{circ}C$ In the thin films a pyrochlore phase seemed to be formed at a lower temperature and then tran-formed to the layered perovskite phase as the heating temperature increased. In the thin films pyrolyzed at formed to the layered perovskte phase as the heating temperature increased. In the films pyrolyzed at $750^{circ}C$ the amount of $Bi_4Ti_3O_{12}{cdot}BaTiO_3$ reached to 94% while $Bi_4Ti_3O_{12}{cdot}BaTiO_3$ was 77% in composition. This result shows that the formation of the layered pervoskite phase becomes difficult as the amount of complexing $BaTiO_3$ increases. The microstructures and the electrical properties of the thin films were gen-erally improved with the incease of the heating temperature. However the presence of the pyrochlore phase could not be removed effectively. Our study showed that the electrical properties of $Bi_4Ti_3O_{12}{cdot}BaTiO_3$ were pronouncedly improved with complexing with BaTiO3 when compared to those of $Bi_4Ti_3O_{12}$ while the presence of the pyrochlore phase was detrimental to the those of $Bi_4Ti_3O_{12}{cdot}2BaTiO_3$.
Key words: Thin film, Sol-gel, $Bi_4Ti_3O_{12}$, $BaTiO_3$, Complexation, Electrical properties
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