Abstract
Bi0.9−xBa0.1RbxFeO3 (x = 0, 0.01, 0.02) nanoparticles were synthesized using a facile sol-gel method. X-ray diffraction (XRD) and Raman spectra measurement confirmed the rhombohedral distorted perovskite structure of our samples. X-ray photoelectron spectroscopy (XPS) analysis demonstrated that oxygen vacancy concentration was increased upon Rb doping, which was responsible for the increase of the leakage current. The magnetization was observed to increase with Rb substitution, which was mainly caused by structural distortion. Interestingly, with the increase of Rb content, UV–visible absorption spectra tended to merge into a single line. In order to explain this phenomenon, the combined effects of oxygen vacancy and FeOFe bond angle were being discussed carefully. Additionally, XPS valence band spectra revealed that the Fermi energy was quite close to the valence band (VB) for our nanoparticles, indicating its p-type conductivity behavior.
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