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摘要Bi4Ti3O12（BTO）是一种典型的铋层状钙钛矿结构的铁电材料，它具有良好的介电性、铁电性、多铁及光催化等性能。我们通过传统的固相法合成了一系列多晶Bi4-xNdxTi3O12（BTO:xNd3+）样品，其中x=0，0.05，0.10，0.15，0.20。经过工艺优化，制备一系列纯相的Nd3+掺杂Bi4Ti3O12粉体，并研究它们发光等特性。通过实验数据分析发现，当热处理温度为750℃时，所有样品中除了BTO主相存在以外，还存在Bi12TiO20杂质相。当热处理温度进一步升高到850℃时，纯BTO相和Bi3.95Nd0.05Ti3O12相中存在极少量的Nd2O3杂质相。当进一步升温到900℃时，BTO相和Bi3.95Nd0.05Ti3O12相是完全纯相，但Bi4-xNdxTi3O12 (x=0.10，0.15，0.20) 的样品中还是存在极少量的Bi12TiO20杂质相，煅烧温度需要进一步提高。通过发射光谱分析，在532nm波长激发下，Bi4-xNdxTi3O12样品的发光都位于1050-1100nm之间，处于近红外波段，对应着Nd3+的4F3/2-4I11/2的跃迁。x=0.15时的发光强度最强。34903
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毕业论文关键词：Bi4Ti3O12；发光性能；固相法
Preparation and properties of Nd3+ doped Bi4Ti3O12
Ferroelectric materials
Abstract
Bi4Ti3O12 is a type of typical ferroelectric materials of bi-layer perovskite structures. It has good dielectricity, ferroelectricity, multiferroic and photocatalytic activities.A series of polycrystalline Bi4-xNdxTi3O12 (BTO:xNd3+) (x=0.05,0.1,0.15,0.2) samples were synthesized through the solid-state reaction method.We prepared pure phase of rare earth doped Bi4Ti3O12 powders and their photoluminescence properties have also been investigated. Experimental datas analysis that when the heat treatment temperature is at 750 ℃, all samples shows BTO main phase , with additional Bi12TiO20 impurity phase. When the heat treatment temperature was further increased to 850 ℃, pure BTO phase and Bi3.95Nd0.05Ti3O12 phase exists, with a very small amount of impurity phases Bi12TiO20. When the temperature was further increased to 900 ℃, pure BTO phase and Bi3.95Nd0.05Ti3O12 phase are completely obtianed, Bi4-xNdxTi3O12 (x = 0.10,0.15,0.20) sample still exists a very small amount of impurity phases Bi12TiO20 at 900 ℃ and, calcination temperature needs to be further improved. By emission spectroscopy, at 532nm excitation wavelength, the light emission Bi4-xNdxTi3O12 samples are located between 1050-1100nm, in the near infrared band, corresponding to the transition of Nd3 + 4F3 / 2-4I11 / 2 in. When x=0.05,the emission intensity is the strongest.
Keywords: Bi4Ti3O12；luminescence property；solid-state reaction method
目录
1 绪论 1
1.1 Bi4Ti3O12晶体概述 1
1.1.1 Bi4Ti3O12晶体结构 1
1.1.2 Bi4Ti3O12晶体性能 2
1.1.3 Bi4Ti3O12晶体的应用 4
1.1.4 Bi4Ti3O12粉体的制备 5
1.2 选题的意义和目的 6
1.3 研究内容和研究目标 6
2 实验部分 8
2.1 原料及试剂 8
2.1.1 固相法原料及试剂 8
2.1.2 水热法原料及试剂 8
2.2 实验设备和仪器 9
2.3 Bi4Ti3O12粉体的制备 10
2.3.1 固相法基本介绍 10
2.3.2 固相法合成Bi4Ti3O12粉体 11
2.3.3 固相法合成Nd掺杂Bi4Ti3O12粉体 12
2.3.4 水热法合成Bi4Ti3O12粉体 12
2.3.5 Bi4-xNdxTi3O12粉体样品表征 13
3 结果与讨论 14
3.1 Bi4-xNdxTi3O12粉体物相分析 14
3.1.1固相法合成未掺杂Bi4Ti3O12粉体 14
3.1.2 固相法合成Bi4-xNdxTi3O12粉体 15
3.1.3 水热法合成Bi4Ti3O12粉体 20
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