Abstract
A BaTiO3 precursor sol was prepared by controlled hydrolysis of Ba-Ti mixed alkoxide solution in methoxyethanol. SrTiO3, BaZrO3 and SrZrO3 precursor sols were also synthesized by the similar method. The hydrolysis condition of Ba-Ti system was as follows; a water-methoxyethanol mixed solution with less than 50vol% of water was added to 3.6×10-4mol/ml of alkoxide solution at room temperature. On adding over 50vol% of water, partial gelation occurred, and heterogeneous sol or gel was formed. For Sr-Ti system, the hydrolysis condition was the same as that for Ba-Ti system. For Ba-Zr and Sr-Zr system, the concentration of water which produces partial gelation was over 66vol%. The formed precursor sols transformed to one phase BaTiO3, SrTiO3, BaZrO3 or SrZrO3 by calcination. Furthermore, the result of EDX analysis for SrTiO3 showed that the obtained powder had homogeneous composition and its homogeneity was kept up to 1000°C. Similar results may be expected for other systems.
