Enhanced Magnetic Properties of Co-Doped BiFeO(3) Thin Films via Structural Progression.
Enhanced Magnetic Properties of Co-Doped BiFeO(3) Thin Films via Structural Progression.
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通过结构进展增强共掺杂 BiFeO3 薄膜的磁性能
DOI：
10.3390/nano10091798
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发表时间：
2020-09-10
期刊：
影响因子：
--
通讯作者：
Liu Y
中科院分区：
文献类型：
--
作者：
Bai L;Sun M;Ma W;Yang J;Zhang J;Liu Y
Co 3+掺杂有望成为改善BiFeO 3磁性能的有效方法。本文采用溶胶-凝胶法制备了纯BiFeO 3（BFO）和掺杂BiFe 1-xCoxO 3（BFCxO，x = 0.01，0.03，0.05，0.07和0.10）复合薄膜。XRD和拉曼光谱表明，Co ~（3+）离子取代了BFO菱面体晶格中的Fe ~（3+）离子位置。由于B位阳离子（Fe 3+和Co 3+）的尺寸失配导致晶格畸变，氧八面体的拉曼振动明显减弱，从而影响了BFC xO的磁性。SEM图像揭示了Co掺杂样品中更密集的团聚。TEM结果表明，Co ~（3+）的掺杂使晶粒尺寸减小。XPS测试结果表明，Co ~（3+）取代Fe ~（3+）有效地抑制了氧缺陷的产生，提高了钙钛矿晶格B位Fe ~（3+）的浓度。振动样品磁强计（VSM）测量结果表明，室温下BFC 0.07O薄膜的剩余磁化强度（Mr）（3.6emu/cm ~ 3）和BFC 0.10O薄膜的饱和磁化强度（Ms）（48.84emu/cm ~ 3）均比纯BFO薄膜提高了近2倍。
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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影响因子：
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作者：
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通讯作者：
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DOI：
10.3390/nano8070526
发表时间：
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期刊：
Nanomaterials (Basel, Switzerland)
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影响因子：
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作者：
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影响因子：
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作者：
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