Size- and Shape-Controlled Synthesis of Ferroelectric Plate-like Particles and Their Piezoelectric Characteristics

M. Macek-Krzmanc, H. Ursic Nemevsek, D. Suvorov, R. Ciobanu

Abstract

Ba_1-xSr_xTiO₃ plate-like particles were prepared by the topochemical transformation of the Bi₄Ti₃O₁₂ template plates in the molten salt. During the conversion, which took place at 900 °C in the presence of high access of BaCO₃ and SrCO₃ (Bi₄Ti₃O₁₂: (BaCO₃+SrCO₃)=1:10) with the initial Ba:Sr molar ratios equal to 0.98:0.02 and 0.9:0.1, the precursor plate shape was well preserved especially in terms of side length, while the average thicknesses of the final perovskite plates were higher compared to that of template. Energy dispersive spectroscopy (EDS) revealed that the initial Ba:Sr ratio was not maintained during the transformation, namely Sr incorporated more than Ba. The initial Ba:Sr=0.98:0.02 and 0.9:0.1 ratios resulted in the tetragonal Ba_0.98Sr_0.06Bi_0.02Ti_0.97O₃ and cubic Ba_0.79Sr_0.24Bi_0.02Ti_0.97O₃ perovskite plates, respectively.<BR /> Local Ferroelectric/piezoelectric hysteresis loops that were obtained using a piezoresponse-force microscope (PFM), indicated the significant ferroelectric response of [001] preferentially oriented µm-sized Ba_0.98Sr_0.06Bi_0.02Ti_0.97O₃ plates.

Keywords

synthesis, piezoelectric characteristics

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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