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Thermodynamics of plagioclase II: Temperature evolution of the spontaneous strain at the \(I\bar 1 \leftrightarrow P\bar 1\) phase transition in anorthite

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Abstract

The temperature dependence of the lattice parameters of pure anorthite with high Al/Si order reveals the predicted tricritical behaviour of the \(I\bar 1 \leftrightarrow P\bar 1\) phase transition at T *c =510 K. The spontaneous strain couples to the order parameter Q° as x i∝S ixQ Q°2 with S 1xQ =4.166×10−3, S 2xQ =0.771×10−3, S 3xQ =−7.223×10−3 for the diagonal elements. The temperature dependence of Q° is

$$Q^{\text{o}} = \left( {1 - \frac{T}{{510}}} \right)^\beta ,{\text{ }}\beta = \tfrac{{\text{1}}}{{\text{4}}}$$

A strong dependence of T *c , S ixQ and β is predicted for Al/Si disordered anorthite.

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  1. Department of Earth Sciences, University of Cambridge, Downing Street, CB2 3EQ, Cambridge, England

    Simon A. T. Redfern & Ekhard Salje

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  1. Simon A. T. Redfern
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  2. Ekhard Salje
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Redfern, S.A.T., Salje, E. Thermodynamics of plagioclase II: Temperature evolution of the spontaneous strain at the \(I\bar 1 \leftrightarrow P\bar 1\) phase transition in anorthite. Phys Chem Minerals 14, 189–195 (1987). https://doi.org/10.1007/BF00308224

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