材料科学
拉曼光谱
X射线光电子能谱
兴奋剂
离子
分析化学(期刊)
磁化
八面体
薄膜
多铁性
矫顽力
磁强计
核磁共振
铁电性
纳米技术
凝聚态物理
磁场
化学
光学
光电子学
电介质
物理
量子力学
有机化学
色谱法
作者
Liang Bai,Mingjie Sun,Wenjing Ma,Jing Yang,Junkai Zhang,Yanqing Liu
出处
期刊:Nanomaterials
[MDPI AG]
日期:2020-09-10
卷期号:10 (9): 1798-1798
被引量:20
摘要
Co3+ doping in BiFeO3 is expected to be an effective method for improving its magnetic properties. In this work, pristine BiFeO3 (BFO) and doped BiFe1-xCoxO3 (BFCxO, x = 0.01, 0.03, 0.05, 0.07 and 0.10) composite thin films were successfully synthesized by a sol-gel technique. XRD and Raman spectra indicate that the Co3+ ions are substituted for the Fe3+ ion sites in the BFO rhombohedral lattice. Raman vibration of oxygen octahedron is obviously weakened due to the lattice distortion induced by the size mismatch between two B-site cations (Fe3+ and Co3+ ions), which has an impact on the magnetic properties of BFCxO. SEM images reveal a denser agglomeration in Co-doped samples. TEM results indicate that the average size of grains is reduced due to the Co3+ substitution. XPS measurements illustrate that the replacement of Fe3+ with Co3+ effectively suppresses the generation of oxygen defects and increases the concentration of Fe3+ ions at the B-site of perovskite lattice. Vibrating sample magnetometer (VSM) measurements show that the remanent magnetization (Mr) of BFC0.07O (3.6 emu/cm3) and the saturation magnetization (Ms) of BFC0.10O (48.84 emu/cm3) thin film both increase by approximately two times at room temperature, compared with that of the pure BFO counterpart.
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