凝胶燃烧法低温合成钇铝石榴石纳米粉体及其表征

以Y(NO3)3.6H2O、Al(NO3)3.9H2O和柠檬酸为原料,采用凝胶燃烧法合成单相钇铝石榴石(Y3Al5O12,YAG)纳米粉体。采用红外光谱、差热分析、X射线衍射、扫描电镜等测试手段对前躯体干凝胶和YAG粉体进行表征,探讨溶胶-凝胶的均质化转变以及YAG相的结晶温度等。结果表明:柠檬酸与Y3+和Al3+以单齿方式进行络合,实现了溶胶-凝胶的均质化转变;前躯体粉末于750℃低温下开始直接由无定形态转变为立方晶系YAG相,没有YAlO3和Y4Al2O9等杂相存在;900℃煅烧2 h得到颗粒呈类球形状,粒径为50 nm左右的YAG粉体。

Synthesis and Characterization of Y3Al5O12 Nano-particles by Gel Combustion Method at Low Temperature

Mono-phase Y3Al5O12(YAG) nano-particles were synthesized by gel combustion method with Y(NO3)3·6H2O,Al(NO3)3·9H2O and citric acid as the main raw materials.The precursor xerogel and YAG powders were characterized by means of infrared spectrum(IR),differential thermal analysis(DTA),X ray diffraction(XRD),scanning electron microscope(SEM) to investigate the homogeneous transition of sol-to-gel,crystallization temperature of YAG phase etc.The results indicated that citric acid coordinate Y3+ and Al3+ in a monodentate fashion and the homogeneous transition of sol-to-gel were achieved.The pure YAG of cubic crystalline phase crystallized from amorphous precursor powders at 750 ℃(no impurity of YAlO3 and Y4Al2O9).The similar spherical YAG particles about 50 nm were obtained at 900 ℃ for 2 h.