Investigation on structural and functional properties of Nd doped BiFeO3 particles prepared by hydrothermal method

Abstract

This study reports the effect of Nd-doping on structural, morphological and optical properties of BiFeO 3 synthesized by hydrothermal method. The X-ray diffraction's results indicate that the samples possess single phase up to 12.5 % Nd doping at the Bi site, and all the samples were pure phase microcrystal having a perovskite structure with a space group of R3c. Through the scanning electron microscope, we find that the particles are nearly spherical morphology and the size decreases with Nd doping. The study of Fourier transform infrared spectroscopy confirms the formation of perovskite structure of prepared BiFeO 3 . Photoluminescence spectroscopy shows Nd doping enhanced the Photoluminescence intensity. Ultravioletvisible absorption spectrum shows BiFeO 3 have a wide absorption band in 550-650 nm wavelength range. The corresponding energy band gap of the samples decreases with the increase of Nd-doping concentration. BiFeO 3 valence band electrons will be excited to the conduction band when the wavelength of visible light is 600-800 nm. It can be used in visible light catalysis. The value of remnant magnetization has improved due to the continuing collapse of the space-modulated spin structure of Bi 0.925 Nd 0.075 FeO 3 microcrystals.

Rationally designed La and Se co-doped bismuth ferrites with controlled bandgap for visible light photocatalysis

“…The characteristic PL signal at 357 nm is ascribed to the radiative emission of nanostructures during the recombination of electron-hole pairs, while the other signals at 378 nm, 400 nm are due to the emission as a result of the recombination owing to the defects, and donor-acceptor interactions. [41][42][43][44] A small kink corresponding 455 nm was observed in pure BFO which correspond to bandgap of 2.72 eV. In comparison to BFO, the BLFSO-50% exhibited a much shorter bandgap of 2.43 eV at emission wavelength of 510 nm.…”

Investigating the influence of Cu and Ti substitution on the structural, optical, and dielectric properties of BiFeO3

“…The 650 nm band stems from a metal-to-metal transition, while the approximately 760 nm band results from a crystal field transition. 49 Nevertheless, the notable absorption band observed around 505 nm is attributed to the electronic transition from the O 2p state to the Fe 3d state. 50 Hence, the energy difference between the top of the valence band (O 2p) and the bottom of the conduction band (Fe 3d) indicates the magnitude of the optical energy bandgap ( E g ).…”

Influence of Cr Doping on Structural, Optical, and Photovoltaic Properties of BiFeO3 Synthesized by Sol-Gel Method

“…The figure shows two absorption edges of pure and Cr-doped BiFeO3 samples: the band at 650 nm is caused by a metal-to-metal transition, while the one around 760 nm is caused by a crystal field transition. [34]. In addition, the pure and Cr-doped BiFeO3 exhibit a significant absorption band at around 540 nm, which is attributable to the electronic transition from the O 2p state to the Fe 3d state [35].…”