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      https://www.ias.ac.in/article/fulltext/boms/037/03/0669-0677

    • Keywords

       

      Mixed oxides; TiO2; transition anatase–rutile; kinetics; sol–gel; XRD.

    • Abstract

       

      MTi𝑋 samples with different atomic chromium percentages were synthesized by sol–gel method and calcined at 400 °C under air. The effects of Cr and temperature on titanium dioxide phase transition were studied. In situ measurement showed the presence of anatase phase for all samples at temperature < 500 °C. Without Cr content, the anatase–rutile transition takes place at 600 °C and the rutile fraction increases with increase of temperature. In the presence of Cr content, rutile phase appeared at 700 °C. Cr2O3 phase was shown only in the case of CrTi20 content at 800 °C which indicates that the segregation remains modest. We have also studied the anatase–rutile transition kinetics by using in situ X-ray measurements. It was found that the anatase phase stability increases as the chromium content increases. Results confirm that the transformation of anatase–rutile is of first order.

    • Author Affiliations

       

      A Bellifa1 L Pirault-Roy2 C Kappenstein2 A Choukchou-Braham3

      1. Laboratory of Materials, Application and Environment; University of Mascara, Mascara, Algeria
      2. Laboratory of Catalysis in Organic Chemistry, University of Poitiers, Poitiers, France
      3. Laboratory of Catalysis and Synthesis in Organic Chemistry, University of Tlemcen, Algeria
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