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WO3對TiO2粉體晶型轉(zhuǎn)變的影響
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Influence of WO3 Additive on Crystallite Structural Transformation of TiO2 Powders
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the National Natural Science Foundation of China (50772064); Xianyang Scientific and Technological Project (K05010-6); Wenzhou Scientific and Technological Project(H20070016); Shaanxi Scientific and Technological Project(2005K06-G4)

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    摘要:

    以TiO2為原料，通過引入WO3添加劑，經(jīng)不同溫度煅燒后得到鎢摻雜的TiO2粉體。利用XRD和SEM等測試手段，研究煅燒溫度、WO3引入量對TiO2粉體晶型轉(zhuǎn)變的影響，并對其機(jī)制進(jìn)行探討。結(jié)果表明：WO3促進(jìn)了TiO2從銳鈦礦向金紅石的轉(zhuǎn)變，降低了TiO2的晶型轉(zhuǎn)變溫度，隨著WO3引入量的增加，促進(jìn)作用增強(qiáng)。引入的WO3以兩種形式促進(jìn)TiO2的晶型轉(zhuǎn)變：一種是Wn+進(jìn)入TiO2晶格置換Ti4+而促進(jìn)了晶型轉(zhuǎn)變；另一種是WO3和TiO2發(fā)生氧化還原反應(yīng)，促進(jìn)了TiO2的晶型轉(zhuǎn)變。

    Abstract:

    The tungsten-doped TiO2 powders were prepared by calcination process at different temperatures, with TiO2 as starting materials and WO3 as additive. The XRD and SEM were used to investigate the influence of calcination temperatures and the content of WO3 on the phase transformation of TiO2 powders. Moreover the transformation mechanism was discussed. The results show that the phase transformation from anatase to rutile of TiO2 powders is mainly attributed to the additive WO3. WO3 can promote the phase transformation and lower the transformation temperatures. The phase transformation of TiO2 are caused by two aspects of WO3, one is the replacement of some Ti4+ by Wn+ in TiO2 crystal lattice, and the other is the redox reaction between WO3 and TiO2. The replacement of Ti4+ by Wn+ during the redox reaction is believed to be the major factor influencing the phase transformation.

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朱振峰,何選盟,趙 毅,任 強(qiáng). WO3對TiO2粉體晶型轉(zhuǎn)變的影響[J].稀有金屬材料與工程,2010,39(5):771~774.[Zhu Zhenfeng, He Xuanmeng, Zhao Yi, Ren Qiang. Influence of WO3 Additive on Crystallite Structural Transformation of TiO2 Powders[J]. Rare Metal Materials and Engineering,2010,39(5):771~774.]
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  • 收稿日期:2009-05-10
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