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Element partitioning at reaction interfaces in a reactive diffusion setting

Untertitel:Spinel layer growth in the MgO-Al2O3 system, experiment and thermodynamic model
Autoren:Abart, RainerSvoboda, Jiri (Czech Academy of Sciences) Jeřabek, Petr (Charles University Prague) Povoden-Karadenitz, Erwin (Technische Universität Wien) Habler, Gerlinde

We report on experimental layer growth of magnesio aluminate spinel (MgAl2O4) at periclase (MgO) corundum (Al2O3) interfaces. Periclase and corundum were contacted and annealed at 1350°C and ambient pressure for 5 to 160 hours. Along the contact a spinel layer formed showing parabolic growth. The spinel exhibits monotonic decrease in Al content from the spinel-corundum interface to the spinel-periclase interface. Whereas the Al-content of spinel is constantly about one mole percent above the equilibrium composition at the spinel-periclase interface, the Al-content of spinel increases with run duration approaching but never attaining local equilibrium at the spinel-corundum interface. Based on these experimental data the kinetic parameters describing long-range diffusion and interface motion in a thermodynamic model are calibrated.

Anzahl der Seiten:2
Publikations Typ:Beitrag in Konferenzband
Buchtitel:Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials : PTM 2015
Editor:Militzer, Matthias
Department of Lithospheric Research
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