微波水热法合成硅酸钇纳米晶

Synthesis of Yttrium Silicates Nanocrystallites by Microwave-hydrothermal Method

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,Y2SiO5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Y2SiO5、Y4.67（SiO4）3O和Y2Si2O7三种晶型的纳米晶,且其晶型最佳。

Yttrium silicate nanocrystallites were synthesized by the microwave-hydrothermal method using Y（NO3） 326H：O, Na2SiO3 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 Y2SiO5 content increase as the synthesis temperature increasing. The increase of annealing temperature is benefit for the growth of yttrium silicates crystallite. Y2Si05, Y4.67 （Si04）30 and Y2Si207 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 rain and annealing at 900 ℃ for 2 h,and the crystal is best.