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Kinetic rate laws derived from order parameter theory III: Al,Si ordering in sanidine

Authors:

Institution:

1. Department of Earth Sciences, Downing Street, CB2 3EQ, Cambridge, England
2. Institut für Mineralogie, Corrensstrasse 24, W-4400, Münster, Federal Republic of Germany

Abstract:

The time dependence of the ordering and disordering of Al and Si in sanidine is described within the framework of the kinetic rate laws developed in papers I and II of this series. It was found that the relevant order parameter Q _t is homogeneous and non-conserved. The rate law is:

$\frac{{dQ_1 }}{{dt}} = - \frac{1}{\tau }exp(--\Delta G_a^* /k_B T)\frac{{\delta G_0 }}{{\delta Q_t }}.$

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