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La3+掺杂对γ-Fe2O3纳米粒子相转变的抑制作用

Suppression the phase transition of γ-Fe2O3 to α-Fe2O3 doping with lanthanium oxide

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【作者】 王海涛华南平杜玉扣杨平

【Author】 WANG Hai-tao,HUA Nan-ping,DU Yu-kou, YANG Ping(Department of Chemistry,Suzhou University,Suzhou 215006,China)

【机构】 苏州大学化学化工学院苏州大学化学化工学院 江苏苏州215006江苏苏州215006江苏苏州215006

【Abstract】 Fe2O3 nanoparticles doped with La(Ⅲ) was prepared using iron citrate as starting material via sol-gel method.Iron oxide nanoparticles were characterized using X-ray diffration, transmission election mieroscope, FTIR and BET,respectively.There was no obvious phase transpfrmation for the sample doped with 4 wt% La2O3 after heating at 400℃ for 8h.This suggests that the transition of the γ-Fe2O3 to the α-Fe2O3,which is thermodynamically stable phase,be effectively suppressed by La(Ⅲ)doping.Meanwhile, the existence of La(Ⅲ)on the surfaces of the nanopar-ticles also takes the role of restraining the particles aggregation during heating process.

【基金】 江苏省自然科学基金(BK2003031);江苏省教育厅自然科学基金(03KJB150115)资助。
  • 【文献出处】 化学研究与应用 ,Chemical Research and Application , 编辑部邮箱 ,2005年03期
  • 【分类号】O614.811
  • 【被引频次】6
  • 【下载频次】103
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