摘要：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。

关键词： 凝胶燃烧法;钇铝石榴石;纳米粉体

Abstract： 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. 

Keywords： gel combustion method； yttrium aluminum garnet； nano-particles