电子陶瓷材料论文：电子陶瓷材料共沉淀法低温自蔓延燃烧法熔盐法空心立方体

电子陶瓷材料论文：电子陶瓷材料共沉淀法低温自蔓延燃烧法熔盐法空心立方体
【中文摘要】钛酸钡（BaTiO3）、钛酸锶（SrTiO3）以及钛酸锶钡（Ba1-xSrxTiO3）皆属于钙钛矿结构,都为重要的电子陶瓷材料,
在电子设备、通讯、催化剂等许多方面都有着广泛应用。

因此,它们的制备是多年来世界范围内的研究热点。

本文用共沉淀法、低温自蔓延燃烧法与熔盐法、熔融水合盐法,分别制备了钛酸钡、钛酸锶以及钛酸锶钡,并对其产品进行了表征。

以Ba（NO3）2、TiO2、H2C2O4·2H2O 为原料,采用草酸盐共沉淀法制备了高纯超细的钛酸钡粉体。

用X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）以及扫描电子显微镜（SEM）对产品的物相组成、纯度以及形貌与颗粒大小进行了表征。

结果显示,所制得的产品纯度高,为单一的四方相、球形颗粒状钛酸钡,其粒度分布范围窄,80%在3μm以下,平均粒径约为2.3μm。

通过
TG-DTA分析并结合不同温度下产品的XRD测试结果,研究了钛酸钡的形成过程。

以Sr（NO3）2、Ti（OC4H9）4、柠檬酸（CA）和NH4NO3为原料,采用低温自蔓延燃烧法制备了钛酸锶纳米粉体。

用TEM、SEM、XRD以及FT-IR等对产品的结构、形貌及成分进行了表征,结果表明,在硝酸锶、硝酸氧钛、柠檬酸以及硝酸铵的摩尔比为1 : 1 : 2 : 8、前躯体溶液的pH=7的条件下制备的产品具有单一立方相钙钛矿结构,分散性好,平均晶粒尺寸约25 nm,晶胞参数为a=0.3913 nm。

并通过TG-DTA研究了钛酸锶粉体的形成过程。

采用熔盐法,在SrCO3、自制
的棒状TiO2和NaCl-KCl共熔混合物体系中,于750 oC煅烧8 h得到了棒状的钛酸锶粉体。

采用SEM、TEM、XRD、以及FT-IR等对产物进行了表征。

结果表明,所制得的棒状钛酸锶,其纯度高,为单一的立方相钙钛矿结构,棒的直径为0.2～1.0μm,长度为2.0～7.0μm,每根
棒均由小晶粒组成。

另外还对棒状钛酸锶的形成机理进行了探讨。

用熔融的Ba（OH）2·8H2O与Sr（OH）2·8H2O作熔剂及反应物,采用熔盐法使之与锐钛型TiO2在180 oC下反应,制备了空心立方体状的钙钛矿型Ba0.7Sr0.3TiO3纳米粉末。

并对产品进行了XRD、SEM、TEM 以及HRTEM表征,结果表明,产品结晶良好,立方体平均边长约为180 nm,每个空心立方体皆由许多小晶粒组成。

研究了不同条件对产品的形貌、结构以及尺寸的影响。

对产物的形成过程作了初步的探讨。

【英文摘要】Barium titanate （BaTiO3）, strontium titanate （SrTiO3） and barium strontium titanate （Ba1-xSrxTiO3）, all belonging to perovskite structure, are all important electronic ceramic materials and are used extensively in electronic equipment, communication equipment, catalysis and so on. Therefore, the preparation of these electronic ceramic materials is hotspot of study for years. In this paper, we prepared BaTiO3, SrTiO3 and Ba1-xSrxTiO3 by coprecipitation method, low-temperature combustion method, molten-salt method and molten hydrated salt method respectively, and the products were ing Ba（NO3）2, TiO2 and H2C2O4·2H2O as raw
materials, highly pure and ultra-fine barium titanate powders were prepared by a prepared oxalate coprecipitation method. By means of XRD, FT-IR and SEM, the phase composition, purity, microstructure and particle size of products were characterized. The results show that the products with a high purity, tetragonal structure and spherical particle shape have a narrow particle size distribution that 80% are below 3μm and the average size is about 2.3μm. The formation process of BaTiO3 was also studied by conbining TG-DTA analysis and the XRD results of products prepared at different temperatures.Strontium titanate nanopowders were prepared by a low-temperature combustion method, using Sr（NO3）2, Ti（OC4H9）4, citric acid （CA） and NH4NO3 as raw materials. XRD, SEM, TEM, and FT-IR were used to study the structure, morphology and constituent of products. The results show that the products prepared under the conditions of the mole ratio of Sr（NO3）2, TiO（NO3）2, CA and NH4NO3 being 1 : 1 : 2 : 8 and the pH value of the precursor solution being 7 were well dispersed single cubic perovskite SrTiO3 nanopowders with an average grain size of about 25 nm and a lattice constant a=0.3913 nm. The crystallization process of the SrTiO3 particles was investigated by TG-DTA.Rod-shaped SrTiO3 powders were
synthesized by a molten-salt method. This method synthesized products from a reaction of SrCO3 and self-made rod-shaped TiO2 with a eutectic mixture of NaCl-KCl at 750 oC for 8 h. The products were characterized with XRD, FT-IR, SEM and TEM. The results show that the rod-shaped SrTiO3 with a diameter of 0.2–1.0μm and a length of 2.0–7.0μm has a cubic perovskite structure and high purity, and these as-synthesized rods are all composed of small crystals. Furthermore, the formation mechanism of SrTiO3 rods was also discussed.With molten-salt method, perovskite Ba0.7Sr0.3TiO3 nanopowders whit hollow cube structure were prepared, using molten Ba（OH）2·8H2O and Sr （OH）2·8H2O as flux, reacted with anatase-TiO2 at 180 oC. The products were characterized with XRD, SEM, TEM and HRTEM. The results show that products are well crystallization. The average edge length of these cubes is about 180 nm and each hollow cube is composed of many small crystals. The effects of various conditions on product morphology, structure and particle size were studied. The formation process of products was preliminarily discussed.
【关键词】电子陶瓷材料共沉淀法低温自蔓延燃烧法熔盐法空心立方体
【英文关键词】electronic ceramic material
co-precipitation low-temperature combustion method molten-salt method hollow cube
【目录】Ba_(1-x)Sr_xTiO_3（x=0-1）超细粉体材料的制备研究
摘要4-5Abstract5-6第1章绪论10-24 1.1 引言
10-11 1.2 钛酸钡概述11-16 1.2.1 钛酸钡的生产应用状况
11-12 1.2.2 钛酸钡的物理、化学性质12 1.2.3 钛酸钡的结构
12-13 1.2.4 钛酸钡晶体的铁电畴13 1.2.5 钛酸钡的性能与
应用13-14 1.2.6 钛酸钡粉体的主要制备方法14-16 1.3 钛酸
锶概述16-21 1.3.1 SrTiO_3 粉体的结构16-17 1.3.2 SrTiO_3
的性能与应用17-18 1.3.3 SrTiO_3 粉体的制备方法
18-21 1.4 钛酸锶钡概述21-22 1.4.1 钛酸锶钡的结构
21 1.4.2 钛酸锶钡的应用21-22 1.4.3 钛酸锶钡粉体的制备
方法22 1.5 本论文的研究内容及其意义22-24第2章由草酸
钡与TiO_2共沉淀制备超细钛酸钡粉体24-30 2.1 引言24 2.2
实验部分24-26 2.2.1 试剂与仪器24-25 2.2.2 样品的制备
25 2.2.3 样品的表征与测试25-26 2.3 结果与讨论
26-29 2.3.1 TG-DTA 分析26-27 2.3.2 XRD 分析
27-29 2.3.3 红外光谱FT-IR 分析29 2.3.4 SEM 分析
29 2.4 小结29-30第3章低温自蔓延燃烧法制备钛酸锶纳米
粉体30-39 3.1 引言30 3.2 实验部分30-33 3.2.1 试剂与
仪器30-31 3.2.2 样品的制备31-33 3.3 结果与讨论
33-38 3.3.1 XRD 分析33-34 3.3.2 SEM 分析34-35 3.3.3
TEM 分析35-36 3.3.4 红外光谱分析36-37 3.3.5 TG-DTA 分
析37-38 3.3.6 产物颜色讨论分析38 3.4 结论38-39第4
章熔盐法制备棒状钛酸锶39-48 4.1 引言39 4.2 实验部分
39-41 4.2.1 试剂与仪器39-40 4.2.2 样品的制备
40-41 4.2.3 样品的表征与测试41 4.3 结果与讨论
41-46 4.3.1 XRD 分析41-43 4.3.2 FT-IR 红外光谱分析
43 4.3.3 SEM 分析43-46 4.3.4 TEM 以及HRTEM 分析
46 4.4 SrTiO_3 微米棒的形成机理讨论46-47 4.5 结论
47-48第5章熔融水合盐法制备空心立方体状纳米钛酸锶钡粉体
48-57 5.1 引言48-49 5.2 实验部分49-50 5.2.1 试剂与
仪器49 5.2.2 样品的制备49-50 5.2.3 样品的表征与测试
50 5.3 结果与讨论50-54 5.3.1 XRD 分析50-51 5.3.2 SEM
分析51 5.3.3 TEM 以及HRTEM 分析51-53 5.3.4 TiO_2 用量
对产物的影响53-54 5.4 形成机理探讨54-56 5.5 小结
56-57结论57-59参考文献59-65致谢65-66个人简
历、攻读硕士学位期间科研成果情况66 1. 发表论文66 2. 发
明专利66
【采买全文】1.3.9.9.38.8.4.8 1.3.8.1.13.7.2.1 同时提供论文写作一对一辅导和论文发表服务.保过包发
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