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J. Korean Ceram. Soc. > Volume 28(11); 1991 > Article
Journal of the Korean Ceramic Society 1991;28(11): 892.
습식 화학법으로 제조된 $PbTiO_3$의 결정화
최병철, 이문호
영남대학교 금속공학과
Crystallization of $PbTiO_3$ Prepared by Wet-Chemical Methods
ABSTRACT
The cyrstallization behavior of lead titanate powders prepared by sol-gel and coprecipitation techniques was investigated. The lead titanate precursors were derived from a mixed solution of lead nitrate and titanium tetrachloride at 4$0^{circ}C$ to 43$^{circ}C$ and pH of 9.00 to 9.75. The X-ray diffraction patterns of the dried gel and coprecipitated powders showed it to be amorphous. DTA runs of the powders indicated crystallization to occur at 475~48$0^{circ}C$. However, the amorphous powders were partially crystallized at 400~45$0^{circ}C$ with sufficient annealing time. The room temperature Raman spectra from heat-treated powders changed continuously from amorphous to crystalline state with increasing heat-treating temperature. By annealing coprecipitated powders, a dramatic change in the Raman spectra due to the structural relaxation as the annealing temperatures increased, was clearly visible. i.e., coprecipitated, gel, and crystalline structure, in turn.
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