The Effect of Calcination on the Surface Composition and Structure of Titanium Dioxide Coated Mica Particles

✍ Scribed by Pekka Eskelinen; Mikko Ritala; Markku Leskelä

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 322 KB
• Volume: 103
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1088

✦ Synopsis

Thin layers of polycrystailine (\mathrm{TiO}{2}) were deposited on flaky muscovite and phlogopite particles. DeposiIion was performed in a water slurry using aqueous (\mathrm{TiCl}{4}) as the titanium source. The effects of heat treatments on the surface composition of thin (\mathrm{TiO}_{2}) films were studied by XPS technique. The surface coniposition was strongly dependent on the calcination temperalure. The substrate components diffused through the film and as a consequence the outermost surface was a mixture of oxides of titanium, siticon, aluminum, and sodium. Surface composition was not affected by calcination after a certain induction period. The diffusing cations are believed to have in effect on the anatase-to-rutile transformation which was observed in the TiO)-phlogopite system but not in the TiO)-muscovite system.
i) 1993 Acadlemic Press, Inc.