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Phase pure nanosized BiFeO 3 ( BFO ) powder was synthesized by sol–gel method based on the propylene glycol‐gel reaction. The formation mechanism, crystal structure, magnetic and optical properties were investigated by thermogravimetry, differential thermal analysis, infrared spectroscopy, X –ray diffractometry, Rietveld analysis, Raman spectroscopy, transmission electron microscopy, SQUID magnetometry and ultraviolet–visible spectroscopy. X –ray diffraction and Raman studies revealed the formation of pure and well‐crystallized BFO nanocrystallites at a low temperature of 400°C. The BFO nanoparticles showed weak ferromagnetic property at room temperature due to size‐confinement effects. The UV –visible spectra showed strong band‐gap absorption at ~590 nm (2.1 eV) for BFO nanoparticles suggesting their potential application as visible‐light‐response photocatalyst.
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Srivastav et al. (2012) studied this question.
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