共沉淀法制备Gd3(In,Al)5O12∶Ce石榴石粉体

Preparation of Gd_3(In,Al)_5O_(12)∶ Ce Garnet Powder by Co-precipitation Method

将Gd_2O_3、In_2O_3、NH_4Al(SO_4)2·12H_2O和Ce_2(CO_3)3试剂溶入稀硝酸制取可溶盐混合溶液,采用NH_3·H_2O和NH_4HCO_3混合溶液沉淀剂,通过共沉淀法获得碱式硫酸碳酸复合盐水合物前驱体,经950℃以上温度烧结处理制备出立方晶系GIAG∶Ce石榴石粉体。应用红外光谱和差热分析研究了前驱体所含特征官能团和热化学行为,应用X射线粉末衍射分析了前驱体经不同温度烧结所出现的物相变化,应用表面电镜和粒度分析表征了GIAG∶Ce粉体的SEM形貌和粒度分布,GIAG∶Ce粉体的荧光光谱呈现365 nm和450 nm两个发光峰,表明Ce^(3+)离子已固溶进入粉体介质晶格。

The solution containing Cd^3＋In^3＋,Al^3＋and Ce^3＋was acquired by dissolving the reagents of Gd2O3、In2O3、NH4Al（SO4）2·12H2O and Ce2（CO3）3in diluted nitric acid. The precursor of sulfate carbonate basic hydrate was synthesised by means of co-precipitation method. GIAG ∶ Ce garnet powder with cubic crystallic system was prepared by sintering the precursor at the temperature above 950 ℃. The characteristic functional group and thermal chemical behavior of the precursor was investigated by infrared spectrum and differential thermal analysis. The phase transformation of the precursor samples subjected with the sintering treatment under the different temperatures was analysised by X-ray powder diffraction.The SEM images and grain size distribution of GIAG ∶ Ce powder was characterized by surface electron microscope and grain size analysis. The Fluorescence spectra of GIAG ∶ Ce powder exhibites two luminescence peaks at the wavelength of 365 nm and 450 nm,which proved that Ce^3＋ions has been doped into the crystalline lattice of garnet powder.