金属アルコキシドから合成されたSrTiO₃微粒子の水中分散に関する陰イオン界面活性剤の検討とそのシート成形に及ぼす影響

抄録

Effects of anionic surfactants on the dispersion of alkoxide-derived SrTiO₃ particles in water and on the formation of SrTiO₃ ceramic sheets were studied in detail. Five kinds of anionic surfactants were examined. All these surfactants enhanced the dispersion of the SrTiO₃ particles in water. Green sheets were prepared from the SrTiO₃ suspensions in aqueous media to which the surfactants and PVA (poly (vinyl alcohol)) were added. The crack- and deformation-free green sheets were obtained from two kinds of suspensions containing the oily alkylbenzenesulfonate type surfactant (mass ratio: SrTiO₃/PVA/surfactant=100/15/20 and 100/15/25). These green sheets were composed of the particles with diameter less than 1μm. The SrTiO₃ ceramic sheets were obtained by heating the green sheets at 1300°C. Linear shrinkage of the sheets during the heat treatment was 30%. Bulk density of the SrTiO₃ ceramic sheets was 4.97g·cm^-3.