【摘要】 用SnCl4 和FeCl3 为原料,采用化学共沉淀法制备掺杂 Fe2O3 的纳米 SnO2,运用差热(DSC)、X射线粉末衍射(XRD)和透射显微镜(TEM)等方法对Fe2O3 和SnO2 混杂纳米粉末的物相和粒径进行了分析。结果发现:与纯 SnO2 相比,(1) 掺杂 Fe2O3 可以降低前驱体 Sn(OH)4 分解制备 SnO2 纳米晶的焙烧温度,从纯 Sn ( OH)4 的分解温度 345. 7℃下降到341.1℃;(2) 掺杂 Fe2O3 可以有效阻碍 SnO2 纳米晶的团聚和长大,前驱体在 650℃焙烧时,纯 SnO2 晶粒在25nm,而掺杂Fe2O3 的SnO2 晶粒可以保持在 2nm左右;(3) 掺杂Fe2O3 使前驱体焙烧制备SnO2 的温度范围更宽,对制备小于10nm的SnO2 纳米晶,纯 SnO2的焙烧温度范围在400~550℃,而掺杂 Fe2O3 的焙烧温度范围在400~650℃;(4) SnO2/Fe2O3 复合粉末在650℃以下,其晶体结构保持溶剂 SnO2 的四方结构,部分Fe元素置换了 Sn的位置;650℃以上,复合粉末从溶剂晶格中析出Fe2O3 形成两相结构。更多还原

【Abstract】 Fe₂O₃ doped nanosized SnO₂ powders have been prepared by chemical co-precipitation method using SnCl₄ and FeCl₃ as starting material. The structural and size of nanosized SnO₂/Fe₂O₃ were investigated by differential scanning calorimeter （DSC） and thermo-gravimetric（TG）, X-ray diffraction （XRD） and transmission electron microscope （TEM） and the main conclusions can be obtained as follows: （1） Fe₂O₃ adulteration can reduce temperature for the Sn（OH）₄ decomposes into nanosized SnO₂, the decomposed temperature is declined from 345.7℃ of pure Sn（OH）₄ to 341.1℃ of composite hydroxide; （2） Fe₂O₃ adulteration can efficiently prevent the reuniting and growing-up of nanosized SnO₂. When the calcination temperature is 650℃, the size of pure SnO₂ is about 25nm and the Fe₂O₃ doped SnO₂ is about 2nm; （3） Fe₂O₃ adulteration can widen the range of calcination temperature for SnO₂. For example, for 10nm SnO₂, the calcination temperature of pure Sn（OH）₄ is 400 to 550℃, that with Fe₂O₃ is 400 to 650℃; （4） Below 650℃, The powders of SnO₂ doped with Fe₂O₃ have tetragonal lattice structure. Fe₂O₃ separated from the SnO₂ crystallites and formed two phase structure above 650℃.更多还原