DISPERSION EFFECT OF POLYOXYETHYLENE-TYPE SURFACTANTS ON ALKOXIDE-DERIVED SRTIO3 PARTICLES AND INFLUENCE OF THESE SURFACTANTS FOR PREPARATION OF SRTIO3 SHEETS

Dispersion effect of polyoxyethylene-type surfactants on aggregation o f alkoxide-derived SrTiO3 particles in water as well as the influence of these surfactants for preparation of SrTiO3 ceramic sheets were stu died. Seven kinds of surfactants were examined. Among these surfactant s, a surfactant having carboxyl group was effective on dispersing aggr egated of SrTiO3 particles. This surfactant was soluble in water. The surfactant solution behaved as a Newtonian fluid. The density and visc osity of the 7.5 mass% surfactant solution were 1.0411 g.cm(-3) and 2. 3 mPa.s. The green sheet could be prepared using a SrTiO3 particles - water system suspension in which aggregation of SrTiO3 particles was c ontrolled by addition of the surfactant. This green sheet was composed of fine particles with a diameter of less than 1 mu m. These constitu ent particles of the green sheet were finer than that in the green she et formed without the addition of surfactant. SrTiO3 ceramic sheets co uld be obtained with successive sintering of the green sheets at 1300 degrees C.