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初步采用碳酸铵作为沉淀剂,采用均相共沉淀法,通过仔细控制沉淀过程的工艺参数,得到了煅烧后可直接生成纯相Nd∶YAG的前驱体。通过热重/差热分析(TG/DTA)、红外光谱(IR)、X射线衍射(XRD)、透射电镜(TEM)等测试手段对前驱物及煅烧粉体进行表征,研究结果表明:碳酸铵和金属离子的摩尔比为7:1时,体系的pH值基本保持在9,无需外加氨水调节溶液的pH值,简化了试验步骤,同时也减少了污染。XRD分析表明,在900℃煅烧该前驱体,得到Nd∶YAG纯晶相;根据谢乐方程计算和TEM分析,经过900℃煅烧所得纳米粉体颗粒尺寸为30～50nm,具有良好的分散性和烧结活性。
The precursors of pure Nd:YAG were obtained directly after calcination by using ammonium carbonate as precipitator and homogeneous coprecipitation method. By carefully controlling the process parameters of the precipitation process, The precursors and calcined powders were characterized by means of TG / DTA, IR, XRD and TEM. The results showed that ammonium carbonate And metal ions molar ratio of 7: 1, the pH of the system remained at 9, without the need to adjust the pH of the solution with ammonia to simplify the test steps, but also reduce the pollution. XRD analysis showed that the precursor was calcined at 900 ℃ to obtain the Nd: YAG pure crystalline phase. According to the Scherrer equation and the TEM analysis, the nano-sized powder obtained after calcination at 900 ℃ had a particle size of 30-50 nm, good dispersibility and Sintering activity.