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Diffusion in Fe-Mg olivine at elevated temperatures Misener, Donald James

Abstract

In the process of deformation of a solid at low strain rates, the rate of atomic migration in the crystal lattice is a critical factor. Experiments designed to measure the diffusion coefficient of Fe in olivine were unsuccessful. It is theoretically shown that at temperatures greater than one-half of the melting temperature the diffusion coefficient of Mg in olivine silicate is an exponential function of temperature and pressure. [formula omitted] The results also indicate that at T > .5Tm and at nonhydrostatic stresses

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