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Thermodynamic mixing behavior of synthetic Ca-Tschermak–diopside pyroxene solid solutions: III. An analysis of IR line broadening and heat of mixing behavior

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Abstract

A series of synthetic Ca-Tschermak–diopside (CaAlAlSiO6–CaMgSi2O6) clinopyroxenes were investigated by powder infrared spectroscopy at room temperature in the wavenumber range 80–2,000 cm−1. Measurable local structural heterogeneities in the crystals are suggested by the line broadening parameter, Δcorr that are observed for intermediate solid-solution compositions. The broadening is most pronounced in the high wavenumber region of the IR spectra that contains stretching modes involving the TO4 polyhedra. The effective line widths for three selected wavenumber regions deviate positively from linear behavior. This is also observed for the enthalpy of mixing of this solid solution. The relationship between “excess Δcorr”, δΔcorr, and heat of mixing, ΔH mix, behavior was investigated for this clinopyroxene series and for several other binary silicate solid solutions. The ΔH mix versus δΔcorr slope values show a linear relationship with respect to the integrated excess volume of the various solid solutions.

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Acknowledgments

This work was supported by a grant from the Deutsche Forschungsgemeinschaft CE 20/13-1,2 to L. Cemic, which is gratefully acknowledged. We thank C.A. Geiger for helpful discussions and for reading the manuscript and P. Kluge for technical support.

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  1. Geowissenschaftliches Institut, Christian-Albrechts-Universität zu Kiel, 24098, Kiel, Germany

    Katja Etzel & Artur Benisek

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  1. Katja Etzel
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  2. Artur Benisek
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Correspondence to Artur Benisek.

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Etzel, K., Benisek, A. Thermodynamic mixing behavior of synthetic Ca-Tschermak–diopside pyroxene solid solutions: III. An analysis of IR line broadening and heat of mixing behavior. Phys Chem Minerals 35, 399–407 (2008). https://doi.org/10.1007/s00269-008-0234-6

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  • DOI: https://doi.org/10.1007/s00269-008-0234-6

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