| 초록 |
The fully crystallized spherical BaTiO3 particles were synthesized at room temperature by gel-sol process that was not reported until now. This simple route offers good control of particle size and morphology, and improvement of the crystallinity of as-prepared powders. The effects of reaction temperature, reaction time and KOH concentration on particle size, morphology and crystallinity of as-prepared powders were presented, and the formation mechanism of spherical BaTiO3 particles by gel-sol method has also shown. Structural evolution of the as-prepared powders was investigated by X-ray diffraction, Fourier transform infrared spectroscopy, and thermal gravimetric analysis/differential thermal analysis. (Ba-Ti) gel used as starting material was prepared by aging process of the mixtures of titanium acylate with barium acetate aqueous solution ([AcOH]/[TIP] = 4, [Ba-acetate]/[TIP] = 1) at 45℃ for 24 hours, and KOH used as catalyst for the formation of BaTiO3.
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