Synthesis and microstructure of partly-oriented bismuth layer structure ferroelectrics ceramics SrBi₄Ti₄O₁₅

Abstract

SrBi₄Ti₄O₁₅ powder was synthesized by conventional solid state synthesis (CS) and molten salt synthesis (MSS). MSS method can synthesize plate-like SrBi₄Ti₄O₁₅ at lower temperature (900°C) than CS method. Plate-like form becomes more distinct when the synthesis temperature increases. This would help cause the grain orientation of the ceramics after sintering. The sintered samples of MSS had grain orientation at (0,0,10) plane. The degree of (0,0,10) grain orientation F was 62.1%. Hot pressing made (0,0,10) grain orientation more distinct (F=85.7%). The microstructures of the sintered samples were detected by SEM. Due to the grain orientation, the density of samples fabricated by MSS was lower than that of prepared by CS.

Keywords

molten salt synthesis / bismuth layer structure ferroelectrics / grain orientation / hot pressing sinter

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