水热合成YFeO3及其性能研究+文献综述
关键词： YFeO3；水热合成法；沉淀法；钙钛矿
Hydrothermal Synthesis of YFeO3 and the Study of its
Properties
Abstract: Rare earth orthoferrite YFeO3 crystal with orthorhombic perovskite structure has
a wide range of applications in the field of the electrode material, gas sensors, photocatalysts
and environment monitoring, etc. The structure of yttrium iron, application and synthesis
methods were reviewed. In view of existing problem of preparation method, hydrothermal
synthesis method was chosen to prepare yttrium iron. As we know, the preparation of yttrium
iron by hydrothermal synthesis method has not been reported. In this study, the influence of
temperature and pH value on the product phase were studied. Research results show that, the
precursors with yttrium oxide, nitric acid, ferric nitrate and ammonia form mixed sediments.
After the precipitate was washed and the optimum synthesis conditions were taken
(temperature at 220 ℃, pH at 10.5, the reaction time of 7 hours), pure YFeO3 powders were
obtained.
Keywords: YFeO3; Hydrothermal Synthesis Method; Method of Precipitation; Perovskite. v
目录
摘要 iv
Abstract . iv
目录 . v
1 绪论 . 1
1.1 铁酸钇 . 1
1.1.1 YFeO3理化性质 . 1
1.1.2 YFeO3晶体结构 . 1
1.1.3 YFeO3 的应用 3
1.1.4 YFeO3 粉体的合成 3
1.2 水热法 . 4
1.2.1 水热法的简介 . 4
1.2.2 水热反应机理 . 4
1.2.3 水热法合成的特点 . 5
1.2.4 水热法制备粉体的主要方法 . 5
1.2.5 溶剂热法的简介 . 6
1.2.6 水热、溶剂热反应装置和技术程序 . 6
1.2.7 水热合成材料的一般步骤 . 6
1.3 本文的立意和主要内容 . 7
1.3.1 本文的立意 . 7
1.3.2 本文的主要内容 . 7
2 实验 . 8
2.1 试剂与仪器 . 8
2.2 实验方案 . 13
2.2.1 方案一 . 13
2.2.2 方案二 . 14
2.2.3 方案三 . 14
2.3 表征方法 . 14
3 结果与讨论 . 16
3.1 前期过滤操作对样品合成的影响 . 18
3.2 后期反应介质对样品合成的影响 . 19
3.3 PH值对样品合成的影响 . 21
3.4 反应温度对 YFEO3合成的影响 22
3.5 反应时间对 YFEO3合成的影响 23
3.6 铁酸钇的 XRD图谱分析 23
3.7 铁酸钇的 SEM图谱分析. 26
4 结论 . 29
致谢 . 30
参考文献 . 31
1 绪论
近年来，关于稀土正铁氧体（ReFeO3）的系列研究已经揭示出其独特的物理与化学