Study of effect of chromium on titanium dioxide phase transformation

Bulletin of materials science

C Kappenstein¹  A Choukchou-Braham³  L Pirault-Roy¹  A Bellifa² 

[1] Laboratory of Catalysis in Organic Chemistry, University of Poitiers, Poitiers, France$$Laboratory of Catalysis in Organic Chemistry, University of Poitiers, Poitiers, FranceLaboratory of Catalysis in Organic Chemistry, University of Poitiers, Poitiers, France$$;Laboratory of Materials, Application and Environment; University of Mascara, Mascara, Algeria$$Laboratory of Materials, Application and Environment; University of Mascara, Mascara, AlgeriaLaboratory of Materials, Application and Environment; University of Mascara, Mascara, Algeria$$;Laboratory of Catalysis and Synthesis in Organic Chemistry, University of Tlemcen, Algeria$$Laboratory of Catalysis and Synthesis in Organic Chemistry, University of Tlemcen, AlgeriaLaboratory of Catalysis and Synthesis in Organic Chemistry, University of Tlemcen, Algeria$$

关键词: Mixed oxides;    TiO2;    transition anataseâ€�?�rutile;    kinetics;    solâ€�?�gel;    XRD.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

MTið‘�?? samples with different atomic chromium percentages were synthesized by solâ€�?�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 anataseâ€�?�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 anataseâ€�?�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 anataseâ€�?�rutile is of first order.

【 授权许可】

Unknown