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无机材料学报

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溶胶-凝胶法制备Sb掺杂的α-Fe2O3纳米晶过程的结构研究

王元生; 李坚+   

  1. 福州大学中心实验室; 福州 350002; 福州大学电子科学与应用物理系, 福州 350002
  • 收稿日期:1998-02-09 修回日期:1998-03-03 出版日期:1998-10-20 网络出版日期:1998-10-20

Structural investigation on Preparation of Sb-Doped Nanocrystalline α-Fe2O3 by Sol-Gel Method

WANG Yuan-Sheng; LI Jian+   

  1. Central Laboratory; Fuzhou University Fuzhou 350002 China; +Elecronic Science Applied Physics Department; Auzhou University Fuzhou 350002 China
  • Received:1998-02-09 Revised:1998-03-03 Published:1998-10-20 Online:1998-10-20

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摘要： 以FeCl3·6H2O为源物质，用溶胶－凝胶法制备了Sb掺杂的α-Fe2O3纳米晶粉末，并用X射线衍射、穆斯堡尔谱仪、差热分析和透射电镜对系统的相转变和显微结构进行了研究．干凝胶为Fe（OH）3非晶相，经一定温度热处理晶化为α-Fe2O3相．体系中掺杂适量的Sb后，Sb分布在非晶颗粒的表面，不影响非晶相的结构，但显著提高了晶化温度，阻缓了α-Fe2O3晶粒的生长，有利于获得纳米晶；对其机理进行了讨论．

关键词: 纳米粉末, 掺杂, 相转变

Abstract: The Sb-doped nanocrystalline α-Fe2O3 powders were prepared by sol-gel method with FeCl3·6H2O as the source
substance. The phase transformation and microstructure of the systems were investigated by XRD, Mossbauer spectrometer, DTA
and TEM. The dry gel is found to be Fe(OH)3 amorphous phase, it transforms to nanocrystalline α-Fe2O3 by annealing at a
certain temperature. When the system is doped with Sb, the impurities distribute on the surface of the Fe(OH)3 amorphous particles. They have no obvious influence on the inner structure of Fe(OH)3
but evidently enhance crystallization temperature, thus take the role of restraining the formation and growth of α-Fe2O3
grains, and are favourable for obtaining α-Fe2O3 nanocrystalline powder.

Key words: nanocrystalline powder, doping, phase transformation

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