ZnSm_2O_4稀土复合氧化物的结构与光谱学性质  

Structure and Spectra of Rare Earth Complex Oxide ZnSm_2O_4

作　　者：张勇[1] 张克立[2] 

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430073 [2]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2008年第6期641-644,共4页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金(20071026);湖北省教育厅基金(Q200615002)资助项目

摘　　要：报道了以流变相-先驱物法制备稀土复合氧化物ZnSm2O4的软化学方法.首先用流变相法合成了草酸盐先驱物,然后用差热分析(DTA)和热重分析(TG)研究了先驱物在空气中的热分解过程;用X射线粉末衍射和红外光谱表征了热分解固体产物;最后研究了ZnSm2O4固体紫外-可见吸收光谱.结果表明,ZnSm2O4为尖晶石结构,晶胞参数a=0.921 453 nm,晶胞体积V=0.782 38 nm3,化合物在紫外-可见范围内存在吸收.其中,236.2 nm为Sm3+—O2-电荷转移跃迁,而383.4,405.2,495.4 nm为Sm3+的4G5/2→7HJ/2(J=5,7,9)的电子跃迁.A soft chemical route was reported for the preparation of ZnSm2 O4 by rheological phase-precursor reaction method. First, the oxalate precursor was synthesized by rheological phase reaction, and then the thermal decomposition of oxalate precursor in air atmosphere was studied by differential thermal analysis （DTA） and thermo-gravimetry （TG）. The solid product of thermal decomposition was characterized by X-rays diffraction （XRD） and Infrared Spectrum, and finally the solid state UV-Vis absorption spectrum of ZnSm2O4 was measured. The results reveal that ZnSm2O4 is a spinel structure with cell pa- rameters α=0. 921 453 nm,V=0. 782 38 nm^3 , and its main UV-Vis absorption area is at 236.2 nm according to electrons transference of Sm3^＋-O^2-, 383.4, 405.2 nm and 495.4 nm according to the electrons transition of ^4G5/2→^7 HJ/2 （J =5,7,9）.

关 键 词：ZnSm2O4 草酸盐先驱物 流变相反应 

分 类 号：O641[理学—物理化学]