【摘要】 用乙醇作为分散剂和保护剂 ,用反向沉淀法制备了 Sn O2 纳米晶。XRD分析表明 ,当焙烧温度低于 2 0 0℃时所合成的 Sn O2 为非晶态纳米粒子 ;当焙烧温度在 40 0～ 80 0℃时 Sn O2 为单相纳米晶 ,属于四方晶系 ,空间群为 P4/mnm。 TEM分析表明 ,Sn O2 纳米粒子呈球形 ,随焙烧温度的升高 ,粒子明显增大。热失重分析表明 ,样品的热失重率主要取决于温度的影响 ,而焙烧时间的影响不大。相对密度测试表明 ,随 Sn O2 纳米晶粒度的增大 ,粉末的密度增大。更多还原

【Abstract】 Nanocrystalline SnO 2 of different sizes were prepared by the reverse dropping precipitation method using ethynol as the dispersive and protective reagent XRD patterns showed that the synthesized SnO 2 was amorphous when calcination temperature was below 200℃;but when calcination temperature reached the range of 400～800℃, the prepared SnO 2 was nanocrystalline with single phase, and was tetragonal in structure with space group P4/mnm TEM photos revealed that the SnO 2 nanoparticles were spherical in shape, and the mean sizes of SnO 2 particles increased with the increase of calcination temperature Weight loss analysis indicated that the weight loss of precursor mainly depended on the calcination temperature, but little depended on the calcination time Measurement of relative density showed that the relative density of SnO 2 nanocrystalline powder increased with the increase in SnO 2 crystal sizes更多还原