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Complex impedance spectroscopy and ionic transport properties of natural leucite, K0.90Na0.08[Al0.98Si2.02]O6, as a function of temperature and pressure

Published online by Cambridge University Press:  05 July 2018

R. L. Jones ,
M. Thrall  and
C. M. B. Henderson
R. L. Jones
Affiliation:
Science and Technology Facilities Council Laboratory, Daresbury, Warrington WA4 4AD, UK
M. Thrall
Affiliation:
Science and Technology Facilities Council Laboratory, Daresbury, Warrington WA4 4AD, UK
C. M. B. Henderson*
Affiliation:
Science and Technology Facilities Council Laboratory, Daresbury, Warrington WA4 4AD, UK School of Earth Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK
*
*E-mail: [email protected]
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Abstract

The temperature (T) and pressure (P) dependence of dielectric and conductivity properties of natural leucite were determined using complex impedance spectroscopy at frequencies from 103 to 106 Hz. Experiments were carried out in a Walker multi-anvil cell at 1 atm and P from 2.5 to 6 GPa and at T from 350 to 800°C. At pressure >6 GPa and temperature >790°C the leucite broke down to kalsilite+sanidine and dielectric properties for this phase assemblage are given at 6.0–7.0 GPa and T to 1050°C.

Leucite conductivity increases with increasing T and decreases with increasing P reflecting their different effects on migration of K cations within the channels in the leucite aluminosilicate framework. Activation energies for K+ migration in leucite increase with increasing pressure (0.74–0.97 eV; 70.0–93.2 kJ/mol) and activation volumes for leucite increase with increasing T (6.42–9.51 cm3/mol; 400–700°C). The latter data provide model K+ cation diameters increasing from 2.7 Å at 400°C to 3.2 Å at 700°C. These values are consistent with the earlier suggestion of Palmer and Salje that the ionic mobility mechanism consists of diffusion along <110> rather than along the main channels parallel to <111>.

Keywords

leucitecomplex impedance spectroscopyconductivitydielectric loss tangentactivation energyactivation volumeK+ ionic migration mechanism
Type
Research Article
Information
Mineralogical Magazine , Volume 74 , Issue 3 , June 2010 , pp. 507 - 519
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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