Zirconium Titanate from Sol–Gel Synthesis: Thermal Decomposition and Quantitative Phase Analysis
✍ Scribed by Edgardo L. Sham; Miguel A.G. Aranda; E.Mónica Farfan-Torres; Juan C. Gottifredi; Marı́a Martı́nez-Lara; Sebastián Bruque
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 327 KB
- Volume
- 139
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
Oxides precursors Zr x Ti 1؊x O 2 (x ؍ 0.22, 0.39, and 0.60) were prepared by a hydrolytic sol-gel process. The amorphous mixed oxides are homogeneous as deduced from electron microscopy and XPS studies. The crystallization of these amorphous oxides was studied by TGA-DTA and thermodiffractometry. Quantitative analysis of the crystalline phases, obtained at 1000°C, was carried out by the Rietveld method. The samples are mixtures of TiO 2 , Zr 5 Ti 7 O 24 , and ZrO 2 oxides, and the stoichiometry of the stable zirconium titanate phase was found to be Zr 5 Ti 7 O 24 and not ZrTiO 4 (؍Zr 6 Ti 6 O 24 ). In this work, the power of Rietveld refinements to determine phase ratios of very related (and thus very overlapped) phases is shown.