多铁性
材料科学
拉曼光谱
纳米颗粒
铁磁性
磁化
磁滞
磁滞
带隙
纳米技术
交换偏差
磁性纳米粒子
化学工程
铁电性
凝聚态物理
光电子学
光学
磁各向异性
电介质
磁场
物理
工程类
量子力学
作者
Heng Wu,Piaojie Xue,Lu Yao,Xinhua Zhu
标识
DOI:10.1016/j.jallcom.2017.10.087
摘要
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 ∼10 K in both ZFC and FC measurements.
科研通智能强力驱动
Strongly Powered by AbleSci AI