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本文首先利用正交试验确定了微乳液鄄高温法合成蓝色发光Sr2CeO4超细粉体的最佳制备条件。接着研究了最佳条件下制备的Sr2CeO4超细粉体的性能。场发射扫描电镜(FE鄄SEM)显示,在850℃、900℃、1000℃或者更高温度下退火4h制备的粉体的形状分别呈球状、梭状和球状,平均粒径分别在100nm左右和1μm以内。X射线粉末衍射数据分析表明,该超细粉体属于正交晶系。室温下的光致发光光谱显示,该粉体的激发光谱有3个激发峰,主峰分别位于262nm、281nm和341nm,而其发射光谱只呈现出1个发射峰,主峰位于约470nm。与高温固相制备方法相比,微乳液鄄高温法可以在较低温度下制备出超细的粉体,而且它不但在262nm处出现了一个新的激发峰,主激发峰和发射峰的位置也分别蓝移了大约30nm和12nm。
In this paper, the optimum conditions for the synthesis of blue luminescent Sr2CeO4 ultrafine powders by microemulsion-high temperature method were determined by orthogonal test. Next, the properties of Sr2CeO4 ultrafine powders prepared under the optimal conditions were studied. Field emission scanning electron microscopy (FE-SEM) showed that the powders prepared at 850 ℃, 900 ℃, 1000 ℃ or higher annealed for 4h were spherical, fusiform and spherical with the average particle size of about 100nm and Within 1μm. X-ray powder diffraction data analysis showed that the ultrafine powder belongs to orthorhombic system. The photoluminescence spectrum at room temperature shows that the excitation spectrum of the powder has three excitation peaks with the main peaks at 262nm, 281nm and 341nm, respectively, and the emission spectrum shows only one emission peak with the main peak at about 470nm. Compared with the high-temperature solid-phase preparation method, the microemulsion-high temperature method can produce ultra-fine powder at a lower temperature, and it not only shows a new excitation peak at 262 nm, the positions of the main excitation peak and the emission peak Also shifted by about 30 nm and 12 nm respectively.