溶胶-凝胶法制备锶铁氧体纳米粉体的研究  

Study on Doped Sr Ferrite Nanoparticles Synthesized by Sol-Gel Method

作　　者：徐键[1] 董建峰[1] 向卫东[2] 鲍前君[1] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211 [2]温州大学,浙江温州325035

出　　处：《稀有金属材料与工程》2008年第A02期463-467,共5页Rare Metal Materials and Engineering

基　　金：浙江省科技厅项目(2006R10038)

摘　　要：掺杂锶铁氧体(SrFe12O19)作为磁性材料和微波材料具有广泛应用。采用以柠檬酸作金属离子络合剂的溶胶-凝胶法合成组份分别为SrTixCoxFe(12-2x)O19,SrNixCoxFe(12-2x)O19,和SrZnxCoxFe(12-2x)O19(x=0～1.5 mol%)的溶胶-凝胶,加热浓缩至自燃.制得铁氧体纳米粉体的先驱粉体,再经900～1100℃烧结制备出铁氧体粉体产物。用XRD研究产物的晶相及其晶粒的平均大小;用TEM和SEM观察粉体形貌。研究结果表明:当Ti/Co共掺时,锶铁氧体的晶相没有变化,相粒平均大小30～50 nm:当Ni/Co或Zn/Co共掺时,锶铁氧体晶相的含量随掺杂量x的增大而减小,并出现Fe3O4晶相和α-Fe2O3晶相杂质;当共掺量为1.5 mol1%时,所得粉体均为Fe3O4晶相、晶粒平均尺寸约40 nm的纳米粉体。Doped strontium ferrites have various applications as magnetic and microwave materials. In the present paper, the doped Sr-ferrite nanoparticles with the compositions of SrTixCoxFe（12-2x）O19, SrNixCoxFe（12-2x）O19, and SrZnxCoxFe（12-2x）O19 （x = 0-1.5 mol%） were attempted to synthesize by the sol-gel method, using the citric acid as the complexing agent of the metal ions. The precursor sols were heated to induce the auto-ignition to obtain the precursor powders. After sintering at 900℃ or 1100℃, the precursor powders changed into ferrite nanoparticles. The crystalline phases and average sizes of the resulting particles were investigated by powder X-ray diffraction （XRD）. Transmitting electron microscopy （TEM） and scanning electron microscopy （SEM） were also used to investigate the shapes and sizes of resulting particles. The crystalline phases of Sr-ferrite nanoparticles with the average size of 30~50 nm do not change after co-doping of Ti and Co. However, the amount of the Sr-ferrite phase decreased with increasing x （in mol%） when co-doping Ni/Co or Zn/Co, and Fe304 crystallites occurred with contamination of α-Fe2O3. When co-doping 1.5 mol% Ni and 1.5 mol% Co, only Fe3O4 phase nanoparticles （- 40 nm in average size） were obtained.

关 键 词：锶铁氧体 溶胶-凝胶法 纳米粉体 

分 类 号：TM277[一般工业技术—材料科学与工程]