微波水热法合成硅酸钇纳米晶

以硝酸钇、硅酸钠和氢氧化钠为主要原料,采用一种新方法-微波水热法可控合成了硅酸钇纳米晶.研究了起始溶液配比,合成温度及退火温度对硅酸钇的影响.采用X射线衍射仪(XRD)和透射电子显微镜(TEM)对粉体进行了表征.结果表明:随着合成温度的升高,Y_2SiO_5的含量增加.低温退火处理有助于提高硅酸钇微晶的结晶程度.选不同配比的溶液体系,经微波水热150 ℃作用10 min后,得到的前驱体于900 ℃下保温2 h,最终可获颗粒尺寸分别为400~600 nm、200~400 nm和400~600 nm的Y_2SiO_5、Y_(4.67)(SiO_4)_3O和Y_2Si_2O_7三种晶型的纳米晶,且其晶型最佳.

Synthesis of Yttrium Silicates Nanocrystallites by Microwave-hydrothermal Method

Yttrium silicate nanocrystallites were synthesized by the microwave-hydrotherma1 method using Y(NO_3)_3·6H_2O, Na_2SiO_3 and NaOH as raw materials. The influence of solution composition, synthesis temperature and annealing temperature on the phase and microstructure of yttrium silicates crystallites were investigated. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to characterize the powders. The results showed that Y_2SiO_5 content increase as the synthesis temperature increasing. The increase of annealing temperature is benefit for the growth of yttrium silicates crystallite. Y_2SiO_5, Y_(4.67)(SiO_4)_3O and Y_2Si_2O_7 crystallites with the particles size of 400-600 nm、200-400 nm and 400-600 nm can be achieved, using different initial solution composition under microwave hydrothermal at 150 ℃ for 10 min and annealing at 900 ℃ for 2 h,and the crystal is best.