【作者】 毛样武；

【导师】 金卓仁；

【作者基本信息】 合肥工业大学 ， 应用化学， 2002， 硕士

【摘要】 纳米材料是当前研究的热点，SrCO₃与SrTiO₃由于其优良性能而备受关注。本论文根据低热固相化学反应原理首次以SrCl₂·6H₂O和（NH₄）₂CO₃为原料成功合成了30—50nm的SrCO₃粉体，克服了一般液相沉淀法易发生粉体团聚和难于制备纳米级SrCO₃粉体的弊端，并通过研究找到了低热固相反应终点的标志。该方法工艺简单且污染少，是一种绿色合成的新方法，极有发展前途。 在此基础上，又以SrCl₂·6H₂O、TiOSO₄·H₂O、（NH₄）₂CO₃为原料经分步研磨固相反应法合成了前驱体，前驱体经焙烧得到100nm的SrTiO₃粉体，研究了研磨方式对产物的影响，另外通过试验确定了焙烧温度为900℃，这远低于一般采用SrCO₃与TiO₂经1200—1350℃高温固相反应合成SrTiO₃的反应温度，因此，可大大改善SrTiO₃电子陶瓷的性能。为进一步降低SrTiO₃合成温度，提高品质和降低粒度，以SrCl₂·6H₂O、Ti（C₄H₉O）₄、KOH为主要原料采用溶胶一沉淀法合成SrTiO₃粉体，研究了PH值、反应温度、搅拌速度以及后续热处理温度对合成SrTiO₃的影响，通过试验找到了一条无需高温焙烧直接反应合成纳米级SrTiO₃的工艺路线，制备的SrTiO₃粉体粒度为70nm，而且该方法可以通过调节工艺参数控制SrTiO₃粉体的大小。更多还原

【Abstract】 Nano-sized materials are researched popularly at present. SrCO3 and SrTiO3 are attracted attention because of their superior performances. In this paper SrCO3 powders are first time synthesized successfully by low temperature solid state reaction with SrCl2 . 6H2O and (NH4)2CO3. The size of SrCO3 is about 30-50nm.Compared with liquid state method, this method produces little conglomeration and is easy to synthesize nanopowders. Symbol that reaction is over has been investigated. The process is simple and produces little pollution, so it is called "green method" and has a bright future.On the basis, precursors are obtained by two step milling with SrCl2 .6H2O, TiOSO4.H2O and (NH4)2CO3. SrTiO3 powder with a particle size of about 100nm is prepared through calcining precursors. The effect of grinding way on product is investigated. At the same time, it is confirmed through experiment that the temperature of calcination is about 900 which is lower than that of high temperature solid state reaction with SrCO3 and TiO2. So the performance of SrTiO3 ceramics can be improved definitely. In order to reduce the reaction temperature and particle size, SrTiO3 powder with a particle size of about 70nm is synthesized by sol-precipitation method with SrCl2 .6H20, Ti(C4H9O)4 and KOH. The effects of PH value, reaction temperature, agitation speed and temperature of last treatment on SrTi03 powders are investigated. The process of synthesis of SrTiO3 powders contains no high temperature calcination. The size of powders can be controlled readily through modifying the factors of process.更多还原