Eu_2Sn_2O_7纳米晶的盐助甘氨酸燃烧法制备及结构表征

Preparation and Structure Characterization of Eu_2Sn_2O_7 Nanocrystals by Salt-assistant Glycine Combustion Method

为了获得高分散、粒度分布均匀的Eu2Sn2O7纳米晶,该文在相对较低的温度下采用了盐助甘氨酸燃烧法制备方法。通过X射线衍射、红外光谱、拉曼光谱及透射电镜等对产物进行了结构表征。结果表明：通过盐助甘氨酸燃烧法在700℃可获得超细的方块状的Eu2Sn2O7纳米晶,其粒度分布均匀,颗粒尺寸约为25 nm;在高分辨电镜图中,其晶格规则,说明所得Eu2Sn2O7纳米晶结晶性好,对应的晶面距为0.298 nm,相应于立方晶系的Eu2Sn2O7纳米晶的（222）晶面;室温下产物的荧光性质检测结果显示,在578-650 nm处出现了特征衍射峰,均相应于Eu^3＋f-f电子跃迁。

To obtain highly dispersed Eu2Sn2O7 nanocrystals with uniform size distribution,a salt-assistant glycine combustion method is used at relatively low temperature.The Eu2Sn2O7 nanocrystals are characterized by X-ray diffraction（XRD）,infrared spectrum（IR）,Raman spectrum and transmission electron microscopy（TEM）.The results show that the ultrafine square-shaped Eu2Sn2O7 nanocrystals can be obtained at 700℃ by this method.The distribution of particle sizes is uniform and the average size is 25 nm.The regular lattices of Eu2Sn2O7 nanocrystals in the high resolution transmission electron microscopy（HRTEM） image show the Eu2Sn2O7 nanocrystals have good crystalline.The interplanar distance of 0.298 nm matches with that of（222） crystallographic plane of the cubic Eu2Sn2O7 structure.The fluorescent property result of Eu2Sn2O7 nanocrystals at room temperature shows the characteristic diffraction peaks appeare at the range of 578~650 nm,which is attributed to the f-f eletron transition of Eu^3＋.