Sodium diffusion experiments in quartz crystals

Details Sodium diffusion experiments in quartz crystals Sodium diffusion experiments in quartz crystals

Apr 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31..539r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 31, Issue 4, pp.539-540

Physics

6

Scientific paper

The diffusion of Na into quartz (thin slabs) was studied under the driving force of a concentration gradient (without a d.c. field) with the use of i.r. measurements and neutron activation analysis. In the course of a saturation process, Na + replaces Li + in certain defect sites in the quartz structure. However, much more Na can be driven into crystals than the initial content in Li. Studying the saturation at different temperatures (400-1000°C), for the saturation concentration c , the relation, c log T [° C ] was found. Calculations of the diffusion coefficients were based on a simple one-dimensional model; a good agreement was found experimentally. The relation D = 3.8 × 10 -2 exp (-24,500/ RT ) describes the temperature dependence of the diffusion coefficient.

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