Properties of enduring high temperature calcining of TiO<inf>2</inf> composite oxide nanocrystals
发布时间：2021-03-15点击次数：
- 关键字：Titanium dioxide;Absorption - Calcination - Crystal growth - Heat treatment - Nanostructured materials - Oxidation - Phase transitions - Temperature;Composite nanocrystals - Composite oxides - Crystalline structure - Heterogeneous phase - Properties enduring high temperature calcining
- 摘要：TiO<inf>2</inf> composite oxide nanocrystals were prepared by chemical co-precipitation method with Al<inf>2</inf>O<inf>3</inf> as heterogeneous composite phase, and the reaction mode, the dehydration approach of products and the composite amount of heterogeneity phase, which influence the properties of enduring high temperature calcining of TiO<inf>2</inf> composite oxide nanocrystals, were particularly studied. Nanocrystal particles of these composite oxides at various heat-treating temperatures were characterized in terms of optical absorbance in UV and visible region and structure. The results show that TiO<inf>2</inf> composite oxide nanocrystals were anatase entirely after calcined at 900°C, and well mixed crystalline structure among which the proportion (mass fraction) of anatase between rutile varies from 80:20 to 20:80 in the range of 950°C-1050°C. The composite nanocrystals after calcined at 950°C were spherical, average diameter 20-30 nm, dispersed equably, and had no reuniting phenomenon, and had the same optical absorbance in UV-vis region with TiO<inf>2</inf> nanocrystal calcined at 700°C. It was the surface absorption and bond inhibition mechanism of Al<inf>2</inf>O<inf>3</inf> existing as amorphism that notably delayed the phase transition process and particles growth of TiO<inf>2</inf> nanocrystals.
- 卷号：36
- 期号：9
- 是否译文：否
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