热处理温度对硅酸钇纳米晶相组成及显微结构的影响

Effect of Thermal Treatment Temperature on Phase Composition and Microstructure of Nano-Yttrium Silicate Powders

以硝酸钇、硅酸钠和氢氧化钠为起始原料,采用微波水热法制备了硅酸钇纳米晶。研究了后期热处理温度对硅酸钇纳米晶的相组成和显微结构的影响。利用X-射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)和透射电子显微镜(TEM)对粉体进行了表征。结果表明:经微波水热可直接合成硅酸钇粉体,但其结晶性能较差,后期热处理有助于提高其结晶性能。随着热处理温度的升高,粉体中Y2SiO5相的含量增加,微晶的微观结构从棉絮状结构逐渐向柱状结构转变,Y2SiO5纳米晶沿[378]取向生长。

Yttrium silicates nanocrystallites were prepared by a microwave-hydrotherma1 method using Y（NO3）3·6H2O,Na2SiO3·9H2O and NaOH as main source materials. The influence of thermal treatment temperature on the phase composition and microstructure of yttrium silicates crystallites was investigated.The yttrium silicates powders were characterized by X-ray diffraction（XRD）,field emission scanning electron microscopy（FESEM）and transmission electron microscopy（TEM）.Results show that yttrium silicates nanocrystallites have been successfully prepared by the microwave-hydrothermal method,but their crystallization property is poor. Y2SiO5 content of the yttrium silicates nanocrystallites increases and the grain changes from cotton fiber pattern to columnar pattern with the increase of thermal treatment temperature. The increase of thermal treatment temperature is also benefit for the growth of yttrium silicates crystallite,and the growth of Y2SiO5 nanocrystallites is along [378].