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|Title:||Ultrafine barium titanate powders via microemulsion processing routes|
|Authors:||Wang, J. |
|Citation:||Wang, J.,Fang, J.,Ng, S.-C.,Gan, L.-M.,Chew, C.-H.,Wang, X.,Shen, Z. (1999). Ultrafine barium titanate powders via microemulsion processing routes. Journal of the American Ceramic Society 82 (4) : 873-881. ScholarBank@NUS Repository.|
|Abstract:||Three processing routes have been used to prepare barium titanate powders, namely conventional coprecipitation, single-microemulsion coprecipitation using diether oxalate as the precipitant, and double-microemulsion coprecipitation using oxalic acid as the precipitant. A single-phase perovskite barium titanate was obtained when the double-microemulsion-derived oxalate precursor was calcined for 2 h at a temperature of as low as 550 °C, compared to 600 °C required by the single-microemulsion-derived precursor. A calcination for 2 h at >700 °C was required for the conventionally coprecipitated precursor in order to develop a predominant barium titanate phase. It was, however, impossible to eliminate the residual TiO2 impurity phase by raising the calcination temperature, up to 1000 °C. The microemulsion-derived barium titanate powders also demonstrated much better powder characteristics, such as more refined crystallite and particle sizes and a much lower degree of particle agglomeration, than those of the conventionally coprecipitated powder, although they contained approximately 0.2 wt% BaCO3 as the impurity phase.|
|Source Title:||Journal of the American Ceramic Society|
|Appears in Collections:||Staff Publications|
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