期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 731, 期 -, 页码 471-477出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.10.087
关键词
BiFeO3 nanoparticles; Sol-gel processing; Structural characterization; Optical properties; Magnetic properties
资金
- National Natural Science Foundation of China [11674161, 11174122, 11134004]
- six big talent peak project from Jiangsu Province [XCL-004]
- open project of National Laboratory of Solid State Microstructures, Nanjing University [M28026]
Synthesis of high-purity BiFeO3 (BFO) nanoparticles is a very challenging task for the scientific community because small amounts of nonstoichiometric BixFeyOz species usually appear as byproducts in most of the synthesis routes. Here, we report on the synthesis of high-purity BFO nanoparticles via a sol-gel process. XRD, Raman and IR spectra demonstrate that the BFO nanoparticles crystallize in a distorted rhombohedral perovskite structure with a space group of R3c. TEM images reveal that the sizes of the BFO nanoparticles are distributed in the range of 30-200 nm. The UV-Vis absorption spectra display that the bandgap of the BFO nanoparticles is 2.21 eV. Magnetic hysteresis loops show that the BFO nanoparticles exhibit weak ferromagnetic behavior at low temperatures, and an exchange bias effect is also observed. Furthermore, an abrupt increase of magnetization with decreasing temperature is observed at similar to 10 K in both ZFC and FC measurements. (C) 2017 Elsevier B.V. All rights reserved.
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