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Alkali ion migration in albite and K-feldspar

Jones, A.; Palmer, D.; Islam, M.S. and Mortimer, M. (2004). Alkali ion migration in albite and K-feldspar. Physics and Chemistry of Minerals, 31(5) pp. 313–320.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1007/s00269-004-0389-8
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Abstract

As part of a study of ion migration mechanisms in feldspars, the dynamical behaviour of the alkali metal cations ions in albite and K-feldspar has been investigated using a combination of dielectric spectroscopy and atomistic computer simulation techniques. The low-frequency dielectric properties of these minerals have been studied from room temperature to 1100 K. At each temperature, the dielectric constant, conductivity and dielectric loss were determined over a range of frequencies from 100 Hz to 10 MHz. At high temperatures a distinct Debye-type relaxation in the dielectric loss spectra was observed for both albite and K-feldspar; the activation energy for these processes was determined to be 1.33 eV in both albite and K-feldspar. Atomistic simulation techniques were used to elucidate the mechanism and energetics of the cation migration processes. Mechanisms involving the conventional hopping of Na+ and K+ ions between cation sites in the (010) plane were found to give calculated energy barriers in good agreement with the experimentally determined activation energies. These results assist in understanding the nature of the processes responsible for the observed dielectric behaviour.

Item Type: Journal Article
ISSN: 0342-1791
Keywords: dielectric-properties; diffusion; sodium; temperature; zeolite; transition; transport; potassium; defect
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Interdisciplinary Research Centre: Biomedical Research Network (BRN)
Item ID: 6147
Depositing User: Astrid Peterkin
Date Deposited: 05 Jan 2007
Last Modified: 10 Mar 2014 10:32
URI: http://oro.open.ac.uk/id/eprint/6147
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