论文部分内容阅读
用微波法在乙醇介质中合成二氧化锆(ZrO2)和6种不同含量的钇稳定二氧化锆(YSZ)纳米晶体,样品经过不同温度的煅烧,分别用X射线衍射(XRD)、EDS元素分析、透射电子显微镜(TEM)和比表面积(BET)等手段进行晶体结构和微观形态的研究。结果表明,用微波法在160℃左右可一步合成二氧化锆纳米晶体,掺杂不同含量的钇可控制二氧化锆的结构从单斜相过渡到立方相。四方相和立方相晶型的YSZ在高温下结构稳定,仍为纳米晶粒,表现了良好的热稳定性。并提出了微波法在乙醇介质中合成二氧化锆的机理。
Zirconium dioxide (ZrO2) and six kinds of YSZ nanocrystals with different contents were synthesized by microwave method in ethanol. The samples were calcined at different temperatures and analyzed by X-ray diffraction (XRD), EDS elemental analysis , Transmission electron microscopy (TEM) and specific surface area (BET) were used to investigate the crystal structure and microstructure. The results show that zirconium dioxide nanocrystals can be synthesized in one step by microwave method at 160 ℃. The structure of yttrium - doped zirconia doped with different contents of transition from monoclinic phase to cubic phase. YSZ, a tetragonal and cubic phase, is structurally stable at high temperatures and is still nanocrystalline, exhibiting good thermal stability. The mechanism of microwave synthesis of zirconium dioxide in ethanol was also proposed.