多铁性复合材料的控制合成与磁电效应研究
毕业论文关键词：多铁性材料；磁电耦合效应；溶胶—凝胶；CoFe2O4/BaTiO3纳米复合材料
Synthesis and magneto-electric effect of CoFe2O4/BaTiO3 multiferroic composites
Abstract ：Multiferroic composites consisting of two or more materials with ferroelectric， ferromagnetic show a magnetoelectric (ME) coupling effect due to the magnetically or electrically induced mechanical deformation between two phases. These materials are attractive because they offer the possibility to control the polarization by a magnetic field or the magnetization by an electric field. The core-shell CoFe2O4 and BaTiO3 nanoparticles were prepared by sol-gel method. Futuremore，ferroelectric/ferrite composites of CoFe2O4/BaTiO3 ceramics were then synthesized by high-speed ball milling method. The difference of the ferroelectric and magnetic properties on the content and ratio of CoFe2O4 has been investigated systematically. A few series of CoFe2O4/BaTiO3 ceramics was prepared from powders by changing the preparation conditions，which include constituent，sintering temperature and sintering duration. The most appropriate preparation conditions，was obtained by the measurement of ferroelectric，dielectric and ferromagnetic properties. Finally, the CoFe2O4/BaTiO3 ceramics sintered at 1200℃ with 2:8 have the best coupling interface, sintering temperature and molar radio. Which has the highest polarization of 0.98µC/cm2 and the lowest leakage current of 1.1×10-6Apms.
Key words：Multiferroic；Magnetoelectric；Sol-Gel；CoFe2O4/BaTiO3 nanocomposites
目录
1绪论 1
1.1 尖晶石型钴铁氧体 1
1.2 钛酸钡 3
1.3 多铁性材料简介 6
1.4 磁电耦合效应 8
1.5 溶胶凝胶法 9
1.6 陶瓷型 CoFe2O4-BaTiO3磁电复合材料 10
1.7 选题的目的和研究内容 12
1.7.1 实验机理 12
1.7.2 研究内容 12
2实验部分 14
2.1 实验过程 14
2.1.1 CoFe2O4单体制备 14
2.1.2 BaTiO3单体制备 14
2.1.3 CoFe2O4/BaTiO3两相复合制备 14
2.1.4 压片及被银 15
2.2 实验原料及实验仪器和设备 16
2.2.1 实验原料 16
2.2.2 实验仪器及设备 16
2.2 仪器设备简介 17
2.2.1 行星式球磨机 17
2.2.2 XRD衍射仪 18
2.2.3 铁电测试原理 18
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