【摘要】 在超声波作用下通过SnCl2·2H2O与NH3·H2O反应制备了纳米SnO2粉体·在pH=5 0条件下,得到的SnO2中不含杂相且接近理论产率·煅烧SnO2粉体可使其晶型由非晶转变为晶态·纳米SnO2粒径生长与煅烧温度关系密切,温度升高,煅烧后得到的SnO2粉体粒径相应增大,二者符合d=0.2027t-30.7750的关系,而煅烧时间对粒径生长的影响不大·实验发现,350℃煅烧15min是SnO2晶型转变的合适条件,得到了20nm左右的球形SnO2晶体·更多还原

【Abstract】 The SnO₂ nanopowder was prepared by the chemical precipitation reaction of SnCl₂·2H₂O and NH₃·H₂O under the action of ultrasonic wave, in which no inclusions were found with a yield approaching theoretical value if controlling pH=5.0. The structure of SnO₂ was transformed from amorphous to crystalline via calcination process, and the calcination temperature affected obviously its grain size which increases with increasing calcination temperature and in accordance to the equation d=0.2027t-30.7750. However, the time for calcination exerts no significant influence on the grain size. It was found preferable that the structure transform of SnO₂ nanopowder is calcined at 350℃ for 15min, thus obtaining the spherical SnO₂ crystals about 20nm.更多还原