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SnO₂/Fe₂O₃ 纳米复合粉的制备与表征

THE PREPARATION AND CHARACTERIZATION OF COMPOSITE NANOCYSTALLINE SnO₂/Fe₂O₃

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【Author】 PAN Dengyu ( Basic Department, Anhui Institute of Electrical and Mechanical Engineering, Wuhu, 241000 ) WANG Dazhi, LIU Wanyu, Yu Wenhai ( Depart of Materials Science and Engineering, University of Science and Technology of China, Heifei, 230026

【机构】安徽机电学院基础部!安徽芜湖； 24100；中国科技大学材料科学与工程系!合肥； 230026；

【摘要】用共沉淀法制备了ＳｎＯ２／ＦｅＯ３纳米复合粉体，用Ｘ射线衍射（ＸＲＤ）、Ｍｓｓｂａｕｅｒ谱研究了它的物相、晶粒度及变化过程。结果表明，煅烧温度在７００ ℃以下时，它可能是以四方ＳｎＯ２纳米晶为主体（其平均粒径为３－０ｎｍ），α－Ｆｅ２Ｏ３纳米晶包裹在ＳｎＯ２晶界的复合相，其中α－Ｆｅ２Ｏ３结晶很不充分，５４－７％聚集于晶界。这种复合相的结构阻碍了ＳｎＯ２晶粒的长大，有利于煅烧后保持纳米晶结构。更多还原

【Abstract】 Gas-sensitive composite nanocrystalline SnO 2/Fe 2O 3 was prepared by coprecipitation method. Its microstructure has been investigated by XRD(X-ray diffraction) and Mssbauer spectroscopy. It is found that it consists mainly of tetragonal SnO 2 with grain size about 3nm. α-Fe 2O 3 nanocrystallites and Fe 2O 3 amorphous phase which probably lies in the region of SnO 2 grain boundories and shows high thermal stability.更多还原