Trans. Met. Soc. AIME · 1962 · 21 citations · 0 references
Natural SciencesChemistryEarth SciencesAnalytical ChemistryInorganic ChemistryPhysical ChemistryCarbon MonoxideIsotope GeochemistryOxide MineralogyOxide MineralsSilicate MineralogySilicate MineralsDiffusion In Silicate MeltsElemental Diffusion In MineralsOxygen DiffusionOxygen Isotope RatiosOxygen Isotope SignaturesOxygen Isotope StudiesSelf-diffusionSilicate Chemistry
The self-diffusion coefficient of oxygen in a liquid silicate slag containing 40% SiO/sub 2/, 40% CaO, and 20% Al/sub 2/O/sub 3/, was determined using the capillary effusion technique. Two stable isotopes of oxygen (O/sup 17/ and O/sup 18/) were used as tracers. After each diffusion run, the slags were reduced with graphite, the evolved carbon monoxide collected and converted into CO/sub 2/. The oxygen isotope concentrations were obtained 4/ and the ratios of the gas. It was found that for O/sup 17/ D = 3.73 x 10/sup 5/ exp/sup -85,000/RT/ cm/sup 2//sec and for O/sup 18/ D = 4 .69 x 10/sup 5/ exp/sup -85,000/RTcm/sup 2/ /sec. Exchange of oxygen between neighboring silicate anions, possibly accompanied by the rotation of these complexes, is a probable diffusion mechanism. The exchange of oxygen atoms between holes in the silicate lattice may also be postulated. (auth)