SnO2/Fe2O3 纳米复合粉的制备与表征

THE PREPARATION AND CHARACTERIZATION OF COMPOSITE NANOCYSTALLINE SnO2/Fe2O3

    摘要
  • 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）、Møssbauer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3－0 nm），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。

     

    Abstract: Gas-sensitive composite nanocrystalline SnO2/Fe2O3 was prepared by coprecipitation method. Its microstructure has been investigated by XRD (X-ray diffraction) and Mössbauer spectroscopy. It is found that it consists mainly of tetragonal SnO2 with grain size about 3 nm. α-Fe2O3 nanocrystallites and Fe2O3 amorphous phase which probably lies in the region of SnO2 grain boundories and shows high thermal stability.

     

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