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| 反向滴定化学共沉淀法制备Bi_0.75 Dy_0.25 O_1.5 纳米粉体的反应机理 | |
| 引用本文： | 袁强,甄强,李榕,高林,倪亮.反向滴定化学共沉淀法制备Bi_0.75 Dy_0.25 O_1.5 纳米粉体的反应机理[J].北京科技大学学报,2010,32(2). |
| 作者姓名： | 袁强 甄强 李榕 高林 倪亮 |
| 作者单位： | 1. 上海大学纳米科学与技术研究中心,上海,200444 2. 上海大学纳米科学与技术研究中心,上海,200444;上海大学材料科学与工程学院,上海,200444 3. 上海大学纳米科学与技术研究中心,上海,200444;上海大学材料科学与工程学院,上海,200444;法国里尔科技大学固体化学与催化国家实验室,里尔,59652 |
| 基金项目： | 教育部重点资助项目(No.208043);;上海市教委重点资助项目(No.07zz10);;白玉兰科技人才基金资助项目(No.2008B049);;上海市教育委员会重点学科建设资助项目(No.J50102) |
| 摘 要： | 以分析纯Bi2O3、Dy2O3为原料,采用反向滴定化学共沉淀法合成前躯体.经热重-质谱分析(TG-MS),前驱体主要是由BiOOH、Dy(OH)3组成,但含有微量BiONO3、Bi2O2CO3.前驱体经过500℃煅烧3h后,X射线衍射仪(XRD)分析结果表明,得到的是单一的β-Bi0.75Dy0.25O1.5粉体,经谢乐公式计算,平均晶粒尺寸在16.02nm左右.X射线荧光光谱仪(XRF)分析结果表明,Bi/Dy摩尔比接近理论计量比.投射电子显微镜(TEM)分析结果表明,粉体颗粒尺寸小于20nm,分散性良好.通过热力学计算对沉淀反应的机理进行了探讨. |
| 关 键 词： | 纳米粉体 氧化铋 氧化镝 反向滴定 化学共沉淀法 反应机理 |
Reaction mechanism of preparing Bi_0.75Dy_0.25O_1.5 nanopowder by the reverse titration chemical coprecipitation method |
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| YUAN Qiang,ZHEN Qiang,LI Rong,GAO Lin,NI Liang.Reaction mechanism of preparing Bi_0.75Dy_0.25O_1.5 nanopowder by the reverse titration chemical coprecipitation method[J].Journal of University of Science and Technology Beijing,2010,32(2). | |
| Authors: | YUAN Qiang ZHEN Qiang LI Rong GAO Lin NI Liang |
| Abstract: | Using analytically pure Bi_2O_3 and Dy_2O_3 as raw materials, the Bi(_0.75)Dy_(0.25)O_(1.5) precursor was prepared by the reverse titration chemical coprecipitation method. By thermogravimetry-mass spectrum (TG-MS) analysis, the results show that the components of the precipitation are BiOOH and Dy(OH)_3 with little BiONO_3 and Bi_2O_2CO_3. After calcining the precursor at 500℃ for 3h, β-Bi(_0.75)Dy_(0.25)O_(1.5) could be obtained and its average grain size is 16.02nm by the Scherrer formula from X-ray diffraction (XRD) analysis. X-ray fluorescence (XRF) analysis shows that the ratio of Bi/Dy extremely approaches to the theoretic stoichiometric ratio. Transmission electron microscope (TEM) analysis results show that the particles size is less than 20nm in good dispersion. The mechanism of preparation reaction was studied by thermodynamic analysis. |
| Keywords: | nanopowder bismuth oxide dysprosium oxide reversing titration chemical coprecipitation reaction mechanism |
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