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采用共沉淀法制备了室温稳定存在的不同晶型纳米ZrO2粉体,用X射线衍射(XRD)、激光拉曼散射(Raman)、N2物理吸附、透射电镜(TEM)和动态光散射技术(DLS)等手段对其晶型结构、晶粒尺寸、比表面积和粒度分布进行了表征,研究了煅烧温度和改性剂掺杂量对晶型结构的影响。结果表明,无掺杂前驱体在850℃煅烧可得到m-ZrO2纳米粉体,比表面积为35.17 m2/g,晶粒尺寸为51.3nm;煅烧温度为600℃,Y2O3掺杂量为4.5%(摩尔分数)时纳米粉体的晶型结构为t-ZrO2,比表面积为39.01 m2/g,晶粒尺寸为19.2nm;煅烧温度为600℃,Y2O3掺杂量为8.5%时可得到比表面积为46.53 m2/g,晶粒尺寸为12.7 nm的c-ZrO2纳米粉体。
The nanocrystalline ZrO2 powders with different crystal forms were prepared by coprecipitation method and characterized by X-ray diffraction (XRD), Raman scattering, N2 physical adsorption, transmission electron microscopy (TEM) and dynamic light scattering ) And other means of its crystal structure, grain size, specific surface area and particle size distribution were characterized to study the calcination temperature and modifier doping on the crystalline structure. The results show that the m-ZrO2 nanopowders can be obtained by calcination at 850 ℃ with a specific surface area of 35.17 m2 / g and a grain size of 51.3 nm. The calcination temperature is 600 ℃ and the Y2O3 doping amount is 4.5% Mole fraction), the crystal structure of the nano-powder is t-ZrO2, the specific surface area is 39.01 m2 / g and the crystallite size is 19.2 nm. The calcination temperature is 600 ℃ and the Y2O3 doping amount is 8.5% 46.53 m2 / g, c-ZrO2 nano-particles with a grain size of 12.7 nm.