Oxygen diffusion through Al-doped amorphous SiO2

    Authors

    Y. G. Wang; Y. H. Sohn; Y. Fan; L. G. Zhang;L. N. An

    Comments

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    Abbreviated Journal Title

    J. Phase Equilib. Diffus.

    Keywords

    carbonitrides; diffusivity measurements; error function modeling; experimental study; mass spectrometry; oxide systems; tracer diffusivity; VITREOUS SILICA; SIALCN CERAMICS; OXIDATION; NETWORK; CARBONITRIDE; CORROSION; CARBIDE; Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy &; Metallurgical Engineering

    Abstract

    Oxygen (O) diffusion through pure and aluminum (Al)-doped amorphous silica is investigated by,using secondary ion mass spectrometry to profile the diffusion of an O-18 tracer. The oxides are formed by the thermal oxidation of polymer-derived SiCN and SiAlCN ceramics. The authors demonstrate that a small amount of Al dopant can significantly inhibit both the interstitial and network diffusion of O. The activation energy of O network diffusion for Al-doped silica is two times higher than that for pure silica. The results are discussed in terms of the modification of Al doping on the network structure of the otherwise pure silica.

    Journal Title

    Journal of Phase Equilibria and Diffusion

    Volume

    27

    Issue/Number

    6

    Publication Date

    1-1-2006

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    671

    Last Page

    675

    WOS Identifier

    WOS:000242471200017

    ISSN

    1547-7037

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