摘要
本工作采用溶胶-凝胶法,在乙醇溶剂中制备了不同掺杂量的二氧化钛超微粉末.通过TG-DTA、XRD和TEM等实验手段对超微粉进行分析和表征.实验结果表明,分别掺杂10mol%、15mol%的氧化锌、氧化镍能得到稳定锐钛矿相固溶体超微粉,但随着掺杂阳离子的增加,二氧化钛的晶化温度升高,且保持锐钛矿相稳定性降低,当掺杂量大于20mol%时,掺杂氧化物以非晶形式在二氧化钛超微粒表面产生偏析.
Ultrafine powder (UFP) TiO2 doped with ZnO and NiO were prepared by sol-gel method in CH3CH2OH solvent. The doped TiO2 UFP were character ized by TG-DTA、XRD and TEM. The experimental results showed that Stable anatase phase solid solution UFP which was doped with 10mol%, 15mol% ZnO or NiO were obtained, TEM photographs showed that amorphous ZnO or NiO was absorbed on the surface of TiO2 solid solution particles when doped amount is more than 20mol%, The experimental results also showed that, the crystalline temperature from amorphous to anatase phase went up and stability of solid solution of anatase phase lowered with increament of doped cations amounts, and the crystalline temperature of samples doped with NiO is higher than that of samples doped with ZnO in the same doped amount, but the temperature of solid state reaction of the former is lower than that of the latter.
