Ultrafine barium titanate powders via microemulsion processing routes

John Wang, Jiye Fang, Ser Choon Ng, Leong Ming Gan, Chwee Har Chew, Xianbin Wang, Zexiang Shen

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    70 Scopus citations

    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.

    Original languageEnglish (US)
    Pages (from-to)873-881
    Number of pages9
    JournalJournal of the American Ceramic Society
    Volume82
    Issue number4
    DOIs
    StatePublished - Jan 1 1999

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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