Lithium diffusion in silicate melts

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Scientific paper

The diffusion properties of Li in an andesitic and pitchstone melt have been determined over the temperature range 1300-1400°C.
The diffusion data have been fitted to an Arrhenius relationship between log D0 and 1/T, and give relatively small activation energies of diffusion: 21.4+/-5.8 kcal mol-1 in the andesite and 20.1+/-2.8 kcal mol-1 in the pitchstone.
Li+, unlike several other cations, shows similar diffusivities in these melt compositions to that in a basaltic melt. Despite the similar ionic radius of Li+ to that of Co2+, the diffusion properties of the two ions are very different from each other.

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