Kinetic Study on the Crystal Transformation of Fe-Doped TiO(2) via In Situ High-Temperature X-ray Diffraction and Transmission Electron Microscopy.
Kinetic Study on the Crystal Transformation of Fe-Doped TiO(2) via In Situ High-Temperature X-ray Diffraction and Transmission Electron Microscopy.
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DOI：
10.1021/acsomega.0c05609
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发表时间：
2021-01-12
期刊：
影响因子：
4.1
通讯作者：
Xu BJ
中科院分区：
文献类型：
--
作者：
Zhang L;Luo X;Zhang JD;Long YF;Xue X;Xu BJ
二氧化钛（TiO 2）由于其不同的晶型和功能而广泛应用于各种主要工业。因此，通过合理的工艺制备合适的晶型TiO 2是必要的。在这项研究中，Fe掺杂的二氧化钛前驱体制备通过水解。此外，原位高温X射线衍射和透射电子显微镜被用来转换其晶体形式的合成前体。Rietveld全谱拟合方法可以在瞬时温度下准确地得到两种不同的晶型。此外，还得到了晶型转变与反应条件之间的速率关系。结果表明，Fe的加入提高了TiO 2由金红石向金红石的相变温度，加速了TiO 2由金红石向金红石的转变过程。晶体相变动力学分析表明，Fe掺杂TiO 2的相变动力学模型符合Johnson-Mehl-Avrami-Kohnogorov（JMAK）模型，其相变受晶体缺陷的影响。最后，Fe掺杂的TiO 2中的Fe 3+被还原为Fe 2+，产生氧空位，从而促进了从钛矿到金红石的转化率。
Titanium dioxide (TiO2) is widely used in various major industries owing to its different crystal forms and functions. Therefore, fabricating suitable crystalline TiO2 through reasonable processes is necessary. In this study, Fe-doped TiO2 precursors were prepared via hydrolysis. Further, in situ high-temperature X-ray diffraction and transmission electron microscopy were used to transform the synthesized precursor in its crystal form. The Rietveld full-spectrum fitting method could accurately yield two different crystal forms at instant temperatures. Additionally, the rate relation between the crystal form transformation and reaction conditions was obtained. Results showed that the addition of Fe increased the temperature of phase transition of TiO2 anatase to rutile and accelerated the anatase → rutile transformation process. Further, crystal phase transition kinetic analysis showed that the phase transition kinetic model of Fe-doped TiO2 matched the Johnson–Mehl–Avrami–Kohnogorov (JMAK) model and that its phase transition was affected by crystal defects. Finally, Fe3+ in Fe-doped TiO2 was reduced to Fe2+ to generate oxygen vacancies, thus promoting the rate of transformation from titanium ore to rutile.
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