Formation and Transformation of TiO2 (Anatase) Solid Solution in the System TiO2—Al2O3 |
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Authors: | Osamu Yamaguchi Yasumichi Mukaida |
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Affiliation: | Department of Applied Chemistry, Faculty of Engineering, Doshisha University, Kyoto 602, Japan |
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Abstract: | In the system TiO2—Al2O3, TiO2 (anatase, tetragonal) solid solutions crystallize at low temperatures (with up to ~ 22 mol% Al2O3) from amorphous materials prepared by the simultaneous hydrolysis of titanium and aluminum alkoxides. The lattice parameter a is relatively constant regardless of composition, whereas parameter c decreases linearly with increasing Al2O3. At higher temperatures, anatase solid solutions transform into TiO2 (rutile) with the formation of α-Al2O3. Powder characterization is studied. Pure anatase crystallizes at 220° to 360°C, and the anatase-to-rutile phase transformation occurs at 770° to 850°C. |
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Keywords: | phase transformations titania alumina anatase solid solutions |
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