一步共沉淀法合成钇铝石榴石纳米粉体

Synthesis of YAG Nano-Powders by Single Step Co-precipitation Method

以Al(NO3)3.9H2O和Y(NO3)3.6H2O为原料,NH4HCO3为沉淀剂,十二烷基苯磺酸(C18H30SO3)为分散剂,采用一步共沉淀法合成钇铝石榴石(Y3Al5O12,YAG)纳米粉体。利用X射线衍射仪、Fourier红外光谱仪、同步热分析仪和场发射扫描电子显微镜对YAG前驱体及不同温度煅烧后的粉体进行表征。结果表明:YAG前驱体化学组成为10[Al(OH)3].3[Y2(CO3)3.3H2O],900℃煅烧2 h后转变为纯YAG相,1 000℃煅烧2 h后得到的粉体晶型完整、分散性好、颗粒尺寸分布均匀,形状近似球形,平均粒径约为65nm。该方法较传统共沉淀法操作步骤简化、参量减少、可重复性提高,因此,更有利于实现工业化批量生产。

Yttrium aluminum garnet （Y3A15O12, YAG） nano-powders were prepared by single step co-precipitati0n method using AI（NO3）3·9H2O and Y（NO3）3·6H2O as raw materials, NH4HCO3 as precipitator, and dodecylbenzene sulfonic acid （C18H30SO3） as dispersion medium. The precursor and calcined nano-powders were characterized by X-ray diffractometer, Fourier transform infrared spectroscopy, thermogravimetry and differential thermal analysis and field emission scanning electron microscope. The result showed that the chemical composition of the precursor was 10[Al（OH）3]·3[Y2（CO3）3·3H2O] and it was transformed into the pure YAG phase after calcined at 900 ℃ for 2 h. The pure cubic YAG powder with average particle size of about 65 nm, complete crystal shape, good dispersion, uniform size distribution and spherical shape was obtained by calcining the precursor at 1 000 ℃ for 2 h. In comparison with the traditional co-precipitation method, this modified method can simplify the experimental operation and reduces the control parameters to improve the repeatability of experiment. So it is more advantageous to realize the industrialization production.