Potassium self-diffusion in a K-rich single-crystal alkali feldspar
- Author(s)
- Fabian Hergemoeller, Matthias Wegner, Manfred Deicher, Herbert Wolf, Florian Brenner, Herbert Hutter, Rainer Abart, Nicolaas A. Stolwijk
- Abstract
The paper reports potassium diffusion measurements performed on gem-quality single-crystal alkali feldspar in the temperature range from 1169 to 1021 K. Natural sanidine from Volkesfeld, Germany was implanted with
43K at the ISOLDE/CERN radioactive ion-beam facility normal to the (001) crystallographic plane. Diffusion coefficients are well described by the Arrhenius equation with an activation energy of 2.4 eV and a pre-exponential factor of 5×10-6m2/s, which is more than three orders of magnitude lower than the
22Na diffusivity in the same feldspar and the same crystallographic direction. State-of-the-art considerations including ionic conductivity data on the same crystal and Monte Carlo simulations of diffusion in random binary alloy structures point to a correlated motion of K and Na through the interstitialcy mechanism.
- Organisation(s)
- Department of Lithospheric Research
- External organisation(s)
- Universität Münster, Universität des Saarlandes, Technische Universität Wien
- Journal
- Physics and Chemistry of Minerals
- Volume
- 44
- Pages
- 345-351
- No. of pages
- 7
- ISSN
- 0342-1791
- DOI
- https://doi.org/10.1007/s00269-016-0862-1
- Publication date
- 05-2017
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105120 Petrology
- Keywords
- ASJC Scopus subject areas
- Geochemistry and Petrology, General Materials Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/d521032e-500b-4c2c-b9fb-1ceb62900698