多铁性复合材料的制备与性能研究
毕业论文关键词：钛酸钡；高温固相法；Fe3O4/BaTiO3；掺杂；铁电性
The preparation and properties of multiferroics materials
Abstract
The structural of the BaTiO3 prepared by standard solid-state reaction have been investigated , the XRD data indicates the tetragonal structure of the BaTiO3.The structural characteristtics of bulk perovskite Fe-doped BaTiO3 which prepared by high temperature solid state method have been studied by X-ray diffractometer(XRD). The ferroelectric properties of this material has also been investigated by ferroelectric tester. X-ray diffraction spectra has proved Fe-doped BaTiO3(BFTO) samples are perovskite structure, and the crystal structure refinements of XRD data indicates that the doping ions make crystal structure of Fe-doped The X-ray diffraction of the prepared samples reveals that the doping ions have replaced titanium ions in the crystal lattice to form BFTO solids which are single phase. The ferroelectric hysteresis loop shows the Fe-doped BaTiO3( BFTO) samples have ferroelectricity. The results show when the doping concentration is 0.4，the Fe-doped BaTiO3( BFTO) have the strongest ferroelectricity.
KeyWords：barium titanate; high temperature solid state method; Fe3O4/BaTiO3; doping; ferroelectricity
目录
第一章 文献综述 1
1.1 引言 1
1.2 电学性能 2
1.2.1 铁电材料与压电材料 2
1.2.2 电导率 3
1.2.3 介电常数 3
1.2.4 介质损耗 3
1.3 BaTiO3的制备方法 3
1.3.1 固相法 4
1.3.2 高能球磨法 5
1.3.3 液相法(湿化学法) 5
1.4 钛酸钡的掺杂行为 6
1.5 研究内容及意义 7
第二章 实验部分 8
2.1 实验原料 8
2.2 实验设备及介绍 8
2.2.1 行星式球磨机 8
2.2.2 激光粒度仪 8
2.2.3 X射线衍射仪 (XRD) 9
2.2.4 扫描电子显微镜（SEM） 9
2.2.5 铁电测试仪 10
2.3 BaTiO3粉体制备 12
2.4 Fe掺杂BaTiO3陶瓷制备 12
2.5 Fe3O4掺杂BaTiO3陶瓷制备 13
第三章 实验分析 15
3.1 BaTiO3合成工艺研究 15
3.1.1 烧结温度对合成钛酸钡的影响 16
3.1.2 粒径大小对合成钛酸钡的影响 17
3.1.3 保温时间对合成钛酸钡的影响 18
3.2 BaTiO3粉体结构分析 19
3.3 Fe掺杂BaTiO3陶瓷结构分析 20
3.4 Fe3O4掺杂BaTiO3陶瓷结构和性能分析 21
3.4.1 结构分析 21
3.4.2 铁电性分析 23
第四章 实验结论 25
致 谢 26