Silicon diffusion in silicate minerals

Details Silicon diffusion in silicate minerals Silicon diffusion in silicate minerals

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997e%26psl.153..229b&link_type=abstract

Earth and Planetary Science Letters, Volume 153, Issue 3-4, p. 229-238.

Computer Science

16

Scientific paper

Recently obtained silicon self-diffusion data, DSi = D0exp(- ΔH/RT), in silicates (quartz, vitreous silica, forsterite, San Carlos olivine and diopside) show a compensation law that is a linear relation, log D0 = log D* + ΔH/2.303 RT*. We find ΔH = 532.6 + 30.4 log D0 (ΔH in kJ/mol and D0 in cm2/s), which corresponds to log D* ~= -17.5 and T*, ~= 1588 K. D* represents a common value of DSi for all these silicates at T*, but also the value of DSi at ΔH = 0. It has, therefore, a pure entropic signification: D* = fa2v~exp(ΔS/R) f is a geometrical factor, a the jump distance and v~ the Si-O vibrational stretching optic frequency almost common to all these silicates. Despite the wide range of enthalpies for Si diffusion in silicates, we propose that the compensation law outlines a unique mechanism for Si migration in minerals with structures based on the SiO4 tetrahedron.

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