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Cation diffusion in titanomagnetites

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Abstract

Interdiffusion couple experiments were performed with titanomagnetite single crystals at 1,000°C, 1,100° C and 1,200° C in various buffered atmospheres. The dependence of the interdiffusion coefficient on oxygen fugacity, composition and temperature was interpreted in terms of point defect structure. Estimates of the cation tracer diffusivities indicate that Fe migrates via a point defect mechanism, involving mixed tetrahedral-octahedral site jumps, with an activation energy of 33 Kcal/mole; whereas Ti migration is one to two orders of magnitude slower, is restricted to octahedral sites and has an activation energy of 60 Kcal/mole.

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Author notes

  1. R. Aragon

    Present address: Department of Chemistry, Purdue University, 47907, West Lafayette, Indiana, USA

  2. R. H. McCallister

    Present address: Exxon Production Research Company, P.O. Box 2189, 77001, Houston, Texas, USA

Authors and Affiliations

  1. Department of Geosciences and Central Materials Preparation Facility, Purdue University, 47907, West Lafayette, Indiana, USA

    R. Aragon, R. H. McCallister & H. R. Harrison

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  1. R. Aragon
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  2. R. H. McCallister
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  3. H. R. Harrison
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Aragon, R., McCallister, R.H. & Harrison, H.R. Cation diffusion in titanomagnetites. Contr. Mineral. and Petrol. 85, 174–185 (1984). https://doi.org/10.1007/BF00371707

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  • DOI: https://doi.org/10.1007/BF00371707

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