Preparation and Characteristics of (Sr, Pb)TiO_3,Ultrafine Particles

The (Sr, Pb)TiO3 ultrafine particles were prepared by oxalate-coprecipitation process, the thermolysisprocess of the coprecipitates (Sr, Pb)TiO(C2O4)2 .4H2O was analyzed and the crystallization temperatureand calcination comdition were defined. The averagc Primary particle size calcined at differenttemperaturcs, the crystal structurcs of sintered body and powders calcilled at different temperatures and thesintering condition of powders were also determined. The results show that the synthetic temperatureof ceramic powdcr prepared by this process is inuch lowcr than that by the conventional solid reactionprocess. The ceramic powder obtained is ultrafine and uniform, and the sintering temperature is lower.Exotic structure with fine grain was observcd, that is, when the particle size is very small, the crystalstructure is not the normal tetragonal ferroelectric structure but cubic paraelectric.