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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 139 (Apr. 2008), p. 123-128 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In their paper, R. Merkle et al [R. Merkle, J. Maier, K.D. Becker and M. Kreye, Phys.Chem. Chem. Phys. 6, 3633 (2004)] conducted an experimental study on the chemical diffusion ofoxygen in Fe-doped SrTiO3 single crystals driven by large changes in the oxygen ambient partialpressure. The stoichiometry dependence of the chemical diffusion coefficient was derived on thebasis of the concept of conservative ensembles for two independent trapping reactions, which thenserved for calculating the evolution of vacancy profiles. The theoretical predictions were comparedto the experimental results. In the framework of the same model, in the present communication, thechemical diffusion of oxygen was analyzed by the concept of a dynamic reaction front [M. Sinder,J. Pelleg, Phys. Rev. E 61, 4935 (2000); Z. Koza, Phys. Rev. E 66, 011103 (2002)]. We show, thatby using a quasi-chemical reaction rate profile, it is possible to obtain information relating to theposition and width of the zone where the reaction takes place. It is indicated, that the reaction ratedistribution can be directly calculated from measured concentration profiles of the immobilereactant
    Type of Medium: Electronic Resource
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