STUDY OF HYDROTHERMAL SYNTHESIS AND PROPERTIES OF Bi₂Fe₄O₉

Highly oriented Bi₂Fe₄O₉ nanosheets can be fabricated with Fe(NO₃)₃ ⋅ 9H₂O and Bi(NO₃)₃ ⋅ 5H₂O using the low-temperature hydrothermal method. The as-prepared powders are characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM), which exhibit an excellent orientation along the (00l) planes. The leakage current density and dielectric properties of the nanosheet samples are measured by Radiant Precision Workstation and HP4291B Impedance Analyzer, respectively. The effects of NaOH concentration on the phase transformation, sheet size and morphologies of the Bi₂Fe₄O₉ crystallites are studied in this paper.