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铁离子掺杂对TiO_2的晶粒生长及晶化过程的影响

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Abstract:

采用溶胶-乳化-凝胶法制备纯TiO2和Fe-TiO2复合体,通过热重-差热分析,X射线衍射和扫描电子显微镜对其热处理过程进行表征,通过晶粒生长动力和热分解反应分析,探讨了铁离子掺杂对TiO2晶粒生长和晶型转变的影响。结果表明铁离子的掺杂使得TiO2在低温条件下的晶化过程加快,晶粒生长速度增大,晶型转变温度升高。其原因是纯TiO2和Fe-TiO2的晶粒生长表观活化能依次为25.179kJ/mol和27.431kJ/mol;热分解活化能分别为13.743kJ/mol和9.024kJ/mol。Fe对TiO2晶粒生长的阻遏作用和热分解活性增大。

References

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