Sodium-potassium interdiffusion in potassium-rich alkali feldspar II: Composition- and temperature-dependence obtained from cation exchange experiments

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ID: 298837
2014
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Abstract
Na-K interdiffusion in disordered potassium-rich alkali feldspar was studied experimentally using cation exchange between gem quality sanidine from the Eifel and alkali-halide melt at temperatures of 800 °C to 1000 °C and at close to ambient pressure. Sodium-potassium interdiffusion coefficient *D*~NaK~ was determined for potassium mole fractions in the range 0.65 ≤ *X*~Or~ ≤ 0.99. At 0.65 ≤ *X*~Or~ ≤ 0.95 the sodium-potassium interdiffusion coefficient is largely independent of composition. At *X*~Or~ ≥ 0.95, it rises sharply with increasing potassium mole fraction. Diffusion perpendicular to (001) is about one order of magnitude faster and less strongly temperature dependent than perpendicular to (010). The parameters of the Arrhenius equation describing the temperature dependence of the sodium-potassium interdiffusion coefficient *D*~NaK~ = *D*~0~Exp (−*E~A~/RT*) were estimated as The results of our direct determinations are compared with theoretical calculations using the corresponding sodium- and potassium tracer-diffusion coefficients, and the processes underlying the observed composition- and temperature dependence of sodium-potassium interdiffusion are discussed.
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openalex_W2122714832 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors A.-K. Schaffer, Elena Petrishcheva, Gerlinde Habler, Rainer Abart, Dieter Rhede, Gerald Giester
Journal american journal of science
Year 2014
DOI
10.2475/09.2014.03
URL
https://ajs.scholasticahq.com/article/65636.pdf
Keywords Keywords not found

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