Kinetics of anatase transition to rutile TiO2 from titanium dioxide precursor powders synthesized by a sol-gel process
Kinetics of anatase transition to rutile TiO2 from titanium dioxide precursor powders synthesized by a sol-gel process
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DOI：
10.1016/j.ceramint.2016.05.101
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发表时间：
2016-08-15
影响因子：
5.2
通讯作者：
Wang, Moo-Chin
中科院分区：
文献类型：
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作者：
Wang, Cheng-Li;Hwang, Weng-Sing;Wang, Moo-Chin
利用差热分析 (DTA)、X 射线衍射、透射电子显微镜 (TEM)、选区电子衍射 (SAED)、纳米束电子衍射 (NBED) 和高分辨率 TEM (HRTEM) 研究了溶胶-凝胶法合成的二氧化钛前体粉末锐钛矿转变为金红石 TiO2 的动力学。 DTA结果表明，残余有机物在436 K时分解。无定形前体粉末转化为锐钛矿型TiO2的转变温度发生在739 K。此外，锐钛矿型TiO2完全转变为金红石型TiO2的转变温度发生在1001 K。锐钛矿型TiO2形成的活化能为128.9 kJ/mol。另一方面，锐钛矿转变为金红石TiO2的活化能为328.4 kJ/mol。在 TEM 图像中可以观察到介孔结构。 (C) 2016 Elsevier Ltd 和 Techna Group S.r.l.版权所有。
Kinetics of anatase transition to rutile TiO2 from titanium dioxide precursor powders synthesized by a sol-gel process have been studied using differential thermal analysis (DTA), X-ray diffraction, transmission electron microscopy (TEM), selected area electron diffraction (SAED), nano beam electron diffraction (NBED) and high resolution TEM (HRTEM). The DTA result shows residual organic matter decomposed at 436 K. The transition temperature for amorphous precursor powders converted to anatase TiO2 occurred at 739 K. Moreover, the full anatase transition to rutile TiO2 occurred at 1001 K. The activation energy of anatase TiO2 formation was 128.9 kJ/mol. On the other hand, the activation energy of anatase transition to rutile TiO2 was 328.4 kJ/mol. Mesoporous structures can be observed in the TEM image. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.