Studies on a basic question of zinc titanates
Studies on a basic question of zinc titanates
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DOI：
10.1016/j.jallcom.2008.08.021
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发表时间：
2009-05
影响因子：
6.2
通讯作者：
Zhong-Chi Liu;Zhong-Chi Liu;D. Zhou;S. Gong;Hui Li
中科院分区：
文献类型：
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作者：
Zhong-Chi Liu;Zhong-Chi Liu;D. Zhou;S. Gong;Hui Li
采用传统的固相反应方法，将锐钛矿型和金红石型的二氧化钛微粉与氧化锌粉末复合，合成了钛酸锌。在此基础上，利用X射线衍射仪和热分析等手段，定性和唯象地讨论了锐钛矿型钛酸锌和金红石型钛酸锌的形成受锐钛矿的存在限制，而钛酸锌的形成只能在金红石型的存在下形成这一基本问题。一方面，首次发现了锐钛矿粉对氧化锌-二氧化钛体系中二氧化锌生成量的粒度效应，并很好地解释了锐钛矿型钛酸锌中二氧化锌的存在。另一方面，提出了一种所谓的RID过程来解释金红石型钛酸锌在低于钛酸锌开始分解温度下的形貌，并与实验结果吻合较好。结果，上述分歧的原因自然暴露出来，也是在固态条件下获得纯的或至少更高质量分数的二氧化锌的关键因素。
Anatase and rutile TiO2crystalline powders were combined with ZnO powder to synthesize zinc titanates using traditional solid-state reaction method, on the basis of which, the disagreement between experimental results and the well-known hypothesis that the formation of Zn2TiO4is limited by the presence of anatase whereas ZnTiO3is formed only in the presence of rutile, a basic but unresolved question, was discussed qualitatively and phenomenologically by means of X-ray diffraction and thermal analysis. On the one hand, a grain size effect of anatase powder on the amount of ZnTiO3product was found out in ZnO–TiO2system for the first time, and can well explain the appearance of ZnTiO3in anatase-derived zinc titanates. On the other hand, a so-called RID process was put forward to interpret the appearance of Zn2TiO4in rutile-derived zinc titanates calcined at temperatures below the onset decomposition temperature of ZnTiO3, and agreed well with the experimental results. As a result, the reasons for the disagreement mentioned above were naturally exposed, and a key factor in the achievement of pure or, at least a higher mass fraction of ZnTiO3under solid-state conditions as well.