Yiyi Zhu

Low-temperature fabrication of Bi25FeO40/rGO nanocomposites with efficient photocatalytic performance under visible light irradiation

Bismuth ferrite/reduced graphene oxide (Bi25FeO40/rGO) nanocomposites have been synthesized by a hydrothermal method, followed by a simple room temperature liquid phase process. Interestingly, X-ray diffraction and scanning electron microscopy analyses indicated that the presence of rGO triggered the transformation of perovskite phase BiFeO3 to sillenite phase Bi25FeO40 at room temperature, while the spindle-like morphology was maintained. Under visible light irradiation, the obtained Bi25FeO40/rGO nanocomposites exhibit high photocatalytic performance for the degradation of methyl orange (MO), suggesting potential applications in photocatalytic and related areas. Furthermore, the function of rGO for the enhancement of photocatalytic activity and the probable mechanism were also discussed on the basis of the results.

Structural, optical and multiferroic properties of Eu, Ba co-doped BiFeO3

Sol–gel method is a commonly used method to prepare multiferroic BiFeO3 nanoparticles. By studying the effects of Eu and Ba co-doped on the structural, magnetic and ferroelectric properties of the samples, we found some regular features on the performance of this doped material. Optical absorption spectra indicate that the doping of Eu and Ba has an effect on the energy band structure. The analysis of UV spectrum shows that the band gap of this doped material is narrowed. Moreover, magnetic hysteresis data reveals a further enhancement of magnetism in the Eu and Ba co-doped sample. And the doping of Eu into BFO can reduce the leakage current and gain good ferroelectric properties.

First principle investigations of the Pbnm phase BiFeO3, BiFe0.875Mn0.125O3 and Bi0.875X0.125Fe0.875Mn0.125O3 (XBFM) (X = Ce, Gd, Lu)

The structural, magnetic, electronic and optical properties of Pbnm BiFeO3 (BFO), BiFe0.875Mn0.125O3 (BFM), Bi0.875X0.125Fe0.875Mn0.125O3 (XBFM) (X = Ce, Gd, Lu) have been investigated by the first...