Ga-Fe3O4的室温合成和谱学表征  

Synthesis and Spectral Characteristic of Ga-Fe_3O_4 at Room Temperature

作　　者：王静[1] 邓彤[2] 杨彩琴[1] 林玉龙[1] 王伟[1] 吴海艳[1] 

机构地区：[1]河北医科大学药学院,河北石家庄050017 [2]中国科学院过程工程研究所,北京100080

出　　处：《光谱学与光谱分析》2008年第3期715-718,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(20076048)资助

摘　　要：采用氧化-沉淀法在室温下合成了不同Ga含量的Ga取代磁铁矿,并对上述产物进行了IR,XRD,Mossbauer等谱学解析和磁滞回线的测量。结果表明:Ga取代磁铁矿的生成可能经过Ga取代的绿锈中间体,但这种中间体在热N2干燥的条件下就能转化成产物磁铁矿;随Ga进入尖晶石结构中,产物的XRD分析表明其晶面间距减小,IR光谱分析表明标志MT—O—MO的振动吸收峰向高波数移动。少量的Ga进入尖晶石结构优先占据A位,且初始溶液中含有少量Ga3+能一定程度抑制非磁性的Fe2O3的生成;随Ga含量的增加,其进入B位的趋势增加。Gallium bearing ferrites with different gallium content were synthesized by oxidation of ferrous and gallium ions under alkaline condition and room temperature.The samples were subjected to IR,XRD,Mossbauer spectral analysis and magnetization characterization.The results indicated that the green-rust intermediate phase would be produced during the procedure of Ga-Fe3O4 formation,and the green-rust intermediate phase was converted to ferrites with spinel structure during the drying under hot-N2 atmosphere.With the introduction of gallium into the spinel structure,the interplanar crystal spacing of the spinel structure decreased,as indicated from XRD spectra,and the lattice vibration of MT—O—MO moved to the high-frequency resulting from IR spectra.A small amount gallium introduction entered the tetrahedral sites preferentially rather than the octahedral sites,and increasing gallium introduction would enhance the occupation of octahedral sites.Furthermore,a small content of gallium in the initial solution could prevent the formation of non-magnetic Fe2O3.

关 键 词：GA 磁铁矿 X射线粉沫衍射 红外 MOSSBAUER谱 

分 类 号：TB32[一般工业技术—材料科学与工程]