Preparation of Ba0.55Sr0.4Ca0.05TiO3 Powders by Chemical Coprecipitation for Low Temperature Sintering Ferroelectric Ceramics

摘要

Ba0.55Sr0.4Ca0.05TiO3(BSCT) powders were prepared both by chemical coprecipitation and solid-state reaction. The characterization by SEM reveal that chemical coprecipitation prepared BSCT powder(coded as BSCTc) is with analogous sphericity mophlogy. Specific surface area results show that BSCTc powder have much larger specific surface area of 15.32 m2.g-1 and smaller particle size of 0.085μm. Different effects of the two BSCT powders on Sintering behavior and microstructure of the ceramic were compared. The results show that the BSCTc powder possess higher sintering activity and can lead to lower densification temperature. When 0.032molH3BO3-0.01mol Li2CO3 was added, the sintering temperature of the BSCTc samples is 870°C and the fired density is 5.16g.cm-3.