La^(3+)掺杂对γ-Fe_2O_3纳米粒子相转变的抑制作用  

Suppression the phase transition of γ-Fe_2O_3 to α-Fe_2O_3 doping with lanthanium oxide

作　　者：王海涛[1] 华南平[1] 杜玉扣[1] 杨平[1] 

机构地区：[1]苏州大学化学化工学院,江苏苏州215006

出　　处：《化学研究与应用》2005年第3期369-371,共3页Chemical Research and Application

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。

摘　　要：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.Fe_2O_3 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% La_2O_3 after heating at 400℃ for 8h.This suggests that the transition of the γ-Fe_2O_3 to the α-Fe_2O_3,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 

分 类 号：O614.811[理学—无机化学]