摘要钙钛矿结构的RFeO3（R代表稀土）是一类重要的材料，具有铁磁、磁光等优良性质。他们在燃料电池、催化剂、气敏材料、半导体材料、磁光材料等领域有着广泛的应用。在RFeO3体系中，SmFeO3是一个有趣的材料，并且很少有文献报道。我们在制备与磁性能方面的研究有益于它将来在是实际中的应用。24173
本实验通过优化工艺，采用溶胶-凝胶自蔓延燃烧法制备了一系列正交钙钛矿结构的SmFeO3纳米粉体。并详细分析了Tb/Mn掺杂对于SmFeO3的结构、形貌和磁性能的影响规律。经过900℃，3h煅烧可以得到纯相的SmFeO3粉体，而经过稀土Tb掺杂之后Sm1-xTbxFeO3的合成温度则需要提高到1100℃，与此相反，完全纯钙钛矿结构的SmFe1-xMnxO3粉体仅需要经过700℃，3h 热处理即可得到。SmFeO3不仅具有铁磁性，而且还表现出明显的顺磁特性，经过Tb和Mn掺杂之后，磁化强度明显增大，铁磁特性得到有效增强。
毕业论文关键词： SmFeO3；磁性；掺杂
Abstract
Perovskite-type RFeO3 (R=rare earth) constitute a very important class of materials due to their ferromagnetism and magneto-optic effects. They have potential for various applications such as fuel cells, catalysts, gas sensors, semiconductors and magneto-optic materials. SmFeO3 is one of the interesting RFeO3 materials, and few related literatures currently reported this material. Our work on its preparation and magnetic property study will be beneficial for its application in practice in future.
A series of orthorhombic perovskite SmFeO3 nanopowders, through optimization of process, have been prepared by sol-gel auto-combustion process. We analyzed the Tb/Mn doping effect on the structure, morphology and magnetic property for SmFeO3 in detail. Through calcination at 900℃ for 3 h, we got pure phase SmFeO3. By Tb doping, the synthesis temperature of Sm1-xTbxFeO3 increased to 1100 ℃, on the contrary, by Mn doping, the synthesis temperature of perovskite-type SmFe1-xMnxO3 powders just needed 700℃. SmFeO3 not only has ferromagnetism, but also showed obvious paramagnetic properties, through Tb and Mn doping, magnetization increases obviously, ferromagnetic properties is effectively enhanced.
KeyWords: SmFeO3; Magnetic propery; Doping
目 录
1 文献综述    1
1.1 前言    1
1.1.1 SmFeO3概述    1
1.1.2 SmFeO3的结构    1
1.2 SmFeO3的性能    2
1.2.1 多波段兼容隐身性    2
1.2.2 波电磁特性及吸波性能    3
1.2.3 对汽油-甲醇具有较高的灵敏度    3
1.3 SmFeO3的应用    3
1.3.1 SmFeO3在磁光器件中的应用    3
1.3.2 SmFeO3在微波器件中的应用    3
1.3.3 SmFeO3在气敏器件的应用    4
1.4 SmFeO3的制备方法    4
1.4.1 溶胶-凝胶法制备SmFeO3    4
1.4.2 热分解配合物前驱体法合成纳米SmFeO3    4
1.4.3 室温固相反应法制备SmFeO3纳米粉体    5
1.5 选题的目的及意义    5
2 实验部分    6
2.1 溶胶-凝胶自燃烧法介绍    6
2.1.1 基本原理    6
2.1.2反应配比的理论计算    6
2.2 实验所需药品    6
2.3 设备和仪器    7
2.4 SmFeO3粉体的制备    7
2.4.1 未掺杂稀土SmFeO3粉体的制备    7
2.4.2 Tb掺杂SmFeO3粉体的制备    8
2.4.3 Mn掺杂SmFeO3粉体的制备    8
3 实验结果与分析    9
3.1 未掺杂SmFeO3粉体    9
3.1.1物相分析    9 稀土掺杂SmFeO3的制备与性能研究:http://www.youerw.com/cailiao/lunwen_17558.html