机构地区: 华南理工大学材料科学与工程学院特种功能材料教育部重点实验室
出 处: 《硅酸盐学报》 2009年第2期304-310,316,共8页
摘 要: 以氧氯化锆和硅酸乙酯为原料,以NaF为矿化剂降低合成温度,采用水热法在160~240℃合成了高纯的ZrSiO4粉体。用X射线衍射、扫描电镜和能谱仪表征了ZrSiO4粉体的物相组成和显微结构。用氮气等温吸附Brunauer-Emmett-Teller法测试了ZrSiO4粉体的表面积和孔结构。结果表明:当F与Zr的摩尔比为2时,ZrSiO4的结晶温度可降低到160℃。ZrSiO4粉体为纳米纤维组成的椭球,大小约为1μm。探讨了ZrSiO4粉体的形成机制和F离子的降低结晶温度的作用,F离子可以代替O离子形成Zr—F和Si—F键,降低形成ZrSiO4的能量势垒,促进了ZrSiO4的结晶。 High-purity zircon powders were prepared using zirconium oxychloride and tetraethoxysilane as starting materials by the hydrothermal method at 160-240 ℃ for 4 h.NaF was added to the gel as mineralizer to promote crystallization of zircon.The phase composition and microstructure of zircon powders were identified by X-ray diffraction,scanning electronic microscopy and energy dispersive X-ray spectroscopy.The surface area and pore structure were measured by N2 adsorption using the Brunauer-Emmett-Teller method...