| TiO2纳米粒子热处理过程相变原因研究 |
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| 引用本文： | 付姚,曹望和,夏天,周立新,田莹.TiO2纳米粒子热处理过程相变原因研究[J].功能材料,2005,36(2):250-251,255. |
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| 作者姓名： | 付姚 曹望和 夏天 周立新 田莹 |
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| 作者单位： | 大连海事大学,光电子技术研究所,辽宁,大连,116026;大连海事大学,光电子技术研究所,辽宁,大连,116026;大连海事大学,光电子技术研究所,辽宁,大连,116026;大连海事大学,光电子技术研究所,辽宁,大连,116026;大连海事大学,光电子技术研究所,辽宁,大连,116026 |
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| 基金项目： | 国家自然科学基金资助项目(60274040) |
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| 摘 要： | 通过差热 热重分析(TG DTA)和 X射线衍射分析(XRD)对热处理过程中 TiO2 纳米粒子相变过程进行了研究。结果表明,在热处理过程中, 纯锐钛矿相TiO2 纳米粒子的相变温度与粉体粒径的大小有关,当粉体粒径<21nm时,金红石相的标准自由能大于锐钛矿相,粉体不会发生相变。当粉体粒径增大到21nm以上时,情况相反,粉体可能发生相变,表现出明显的尺寸效应。
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| 关 键 词： | TiO2 热处理 相变 表面自由能 |
| 文章编号： | 1001-9731(2005)02-0250-02 |
Study on phase transition of nano-size TiO2 during the heat treatment |
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| FU Yao,CAO Wang-he,XIA Tian,ZHOU Li-xin,TIAN Ying.Study on phase transition of nano-size TiO2 during the heat treatment[J].Journal of Functional Materials,2005,36(2):250-251,255. |
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| Authors: | FU Yao CAO Wang-he XIA Tian ZHOU Li-xin TIAN Ying |
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| Abstract: | In this paper, the process of phase transition of nano-size TiO_2 during the heat treatment was studied by means of TG-DTA and XRD analysis. The results showed that phase transition temperature of nano-size pure anatase TiO_2 was relative to the particle-size of the powder. The standard free energy of rutile is higher than the one of anatase when the particle-size was no more than 21nm, so that the phase transition of powder can not occur. As the increment of particle-size over 21nm,however , the situation is just reverse and the phase transition may be able to happen. These phenomena show an obvious effect of dimension. |
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| Keywords: | titanium dioxides heat treatment phase transition surface free energy |
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