Thermodynamic modelling of non-convergent ordering in orthopyroxenes: a comparison of classical and Landau approaches期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Thermodynamic modelling of non-convergent ordering in orthopyroxenes: a comparison of classical and Landau approaches

Authors:

Herbert Kroll Hartmut Schlenz Michael W Phillips

Institution:

1. Institut für Mineralogie, Westf?lische Wilhelms-Universit?t Münster, Corrensstr. 24, D-48149, Münster, Germany
2. Department of Geology, University of Toledo, 2801 W. Bancroft Street, 43606, Toledo, Ohio, USA

Abstract:

The excess Gibbs free energy due to non-convergent ordering is described by a Landau expansion in which configurational and non-configurational entropy contributions are separated:

$G^L = - hQ_t + \tfrac{1}{2}a^* (T - T_c^* )Q_t^2 + \tfrac{1}{n}e_n Q_t^n - TS_{conf \cdot }^{ord}$

Keywords:
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