Hydrothermal Synthesis of Bismuth Sodium Titanate Nanowires and Forming Mechanism

doi:10.3724/SP.J.1077.2011.01251

Abstract

Abstract: The Na_0.5Bi_0.5TiO₃ nanowires with perovskite structure were successfully synthesized by the hydrothermal method using Bi(NO₃)₃-5H₂O, H_1.07Ti_1.73O₄-nH₂O and NaOH as the starting materials. The products were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM) and energy dispersive spectroscope (EDS), respectively. The phase structure, morphology, and chemical compositions of products synthesized at 200℃ by hydrothermal process for different times were investigated and the forming mechanism of nanowires was introduced. The results indicate that H_1.07Ti_1.73O₄-nH₂O is a compound with lepidocrocite-like layered structure, and the Na⁺, Bi³⁺ ions can exchange with H₃O⁺ in the interlay space of plate-like titanates in the hydrothermal process. Then the plate-like titanates are transformed into plate-like Na_0.5Bi_0.5TiO₃ particles by in situ reaction. With the hydrothermal reaction progressing, the plate-like Na_0.5Bi_0.5TiO₃ particles split into nanowires. The nanowires are well dispersed with perovskite structure. The width of nanowire is ranging from 30 nm to 150 nm and the length is about several micrometers to tens of micrometers.

Key words: hydrothermal synthesis, bismuth sodium titanate, nanowires, perovskite, forming mechanism

CLC Number:

TM22

MA Xiao, XUE Li-Hong, YAN You-Wei. Hydrothermal Synthesis of Bismuth Sodium Titanate Nanowires and Forming Mechanism[J]. Journal of Inorganic Materials, 2011, 26(12): 1251-1255.

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