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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
【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.
【关键词】 溶胶凝胶法;
纳米γ-Fe2O3;
氧化镧;
相变;
【Key words】 sol-gel method; γ-Fe2O3 nanoparticle; lanthanum oxide; phase transformation;
【Key words】 sol-gel method; γ-Fe2O3 nanoparticle; lanthanum oxide; phase transformation;
【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