Abstract: Pure-phase yttrium aluminum garnet（YAG）powders were synthesized by co-precipitation method using Al(NO3)3·9H2O，Nd2O3 and Y2O3 as raw materials，NH4HCO3 as precipitator and (NH4)2SO4 as dispersion medium. The synthesis was optimized with L9（34）orthogonal experimental design by selecting four factors，such as the concentration of Al3+ and NH4HCO3，titration rate and pH value. Results showed that pH value had a significant effect. Pure-phase YAG powders were all obtained with replication experiments under the optimized conditions. The obtained pure-phase YAG powders and their precursors were characterized by TG/DTA，XRD，FTIR and TEM. By calcining the precursor at 1000 ℃，well dispersive and spherical pure-phase YAG nano-powders with an average particle size of about 23 nm were obtained.

摘要： 为了获得制备纯相YAG纳米粉体且重现性好的工艺，本实验以Al(NO3)3·9H2O、Nd2O3、Y2O3和NH4HCO3为原料，(NH4)2SO4为静电稳定剂，采用L9（34）正交试验方案研究了金属离子溶液浓度、NH4HCO3浓度、滴速和pH值4个重要因素对YAG粉体制备的影响，结果表明pH值是影响YAG纯相的主要因素。获得最佳工艺条件并进行了重复性试验研究，均得到了纯相YAG粉体。采用TG/DTA、XRD、FT-IR、TEM等测试手段对YAG粉体及前体进行表征，结果发现在1000℃煅烧温度下前体已完全转变成YAG相，得到了类球形、分散性较好、尺寸为23 nm的YAG粉体。