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采用无机盐溶胶—凝胶法制备了颗粒均匀的形态为针状的(Eu2+,Dy3+)SrAl2O4纳米粉体。通过TGDTA分析和X射线衍射和扫描电镜分析方法,对样品进行了微观结构和表面形态的表征。研究了纳米(Eu2+,Dy3+)SrAl2O4粉体在不同烧结温度下固相反应过程和成相规律。实验结果表明,当样品的烧结温度为500℃时是单一的Sr(NO3)2晶相;750℃左右生成了Sr3Al2O6,并伴有少量SrAl2O4晶体;1100℃是生成了结晶度良好的针状纳米(Eu2+,Dy3+)SrAl2O4粉体。通过计算,样品粉体晶粒平均为80～100nm。该晶体粒度随烧结温度升高而逐渐变大。
Inorganic salt-sol-gel method was used to prepare SrAl2O4 nanopowders with uniform particle morphology (needle-shaped). The samples were characterized by microstructure and surface morphology by TGDTA analysis and X-ray diffraction and scanning electron microscopy. The solid phase reaction process and phase transformation of SrAl2O4 nanometer (Eu2 +, Dy3 +) powders at different sintering temperatures were studied. The experimental results show that Sr3Al2O6 with a small amount of SrAl2O4 is formed at about 750 ℃ when the sintering temperature of the sample is 500 ℃, and the needle-shaped nano-crystals with good crystallinity are formed at 1100 ℃ (Eu2 +, Dy3 +) SrAl2O4 powder. By calculation, the average grain size of the sample is 80 ~ 100nm. The grain size gradually increases with increasing sintering temperature.