Coalescence of anatase

Coalescence of anatase in the presence of oxygen and hydrogen chloride with or without water vapor... 

To illustrate what preceded, we will treat in detail the case of the coalescence of the titanium dioxide (anatase) in the presence of water vapor and of oxygen. We will mention the results obtained for the anatase in the presence of oxygen and hydrogen chloride, with or without water vapor, and we will approach, in connection with ceria, the influence of foreign elements. These examples will enable us to see how the influences of the intensive constraints are introduced into rates of coalescence via their influences on the reactivity. 

Schultzlam S, Beveridge TJ (1994) Physicochemical characteristics of mineral-forming S-layer from the cyanobacterium Synechococcus strain GL24. Canadian J Microbiol 40 216-223 Shannon RD, Pask JA (1965) Kinetics of the anatase-ratile transformation. J Am Ceram Soc 48 391-398 Shen P, Lee WH (2001) (11 l)-specific coalescence twinning and martensitic transformation of tetragonal Z1O2 condensates. Nanoletters (in press) (web release)... 

This study [HEB 90], to our knowledge is the first one, which introduces a mechanism with elementary steps and makes it possible to include the effects of the partial pressures of water and oxygen on the speed of coalescence. The authors indeed showed that at 823 K, the speed of variation of specific area (of initial value of approximately 100 m /g), at constant specific area, for anatase powder varied with these two pressures according to a law proportional to the product PnJ) withp = 2 and q ranging between 6 and 14. 

---