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Determination of Gibbs free energies of formation for the silicates MnSiO3, Mn2SiO4 and Mn7SiO12 in the temperature range 1000–1350 K by solid state emf measurements

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Abstract

Standard Gibbs free energies of formation (A f G0) for the minerals rhodonite (MnSiO3), tephroite (Mn2SiO4) and braunite (Mn7SiO12) have been determined by measuring the oxygen fugacities of the following redox equilibria: 3Mn2SiO4(s)+1/2O2(g)⇌3MnSiO3(s)+Mn3O4(s) MnSi03(s)+2Mn3O4(s)+1/22O2(g)⇌Mn7SiO12(s) and 7MnSiO3(s)+3/2O2(g⇌Mn7SiO12)(s)+6SiO2(s) The measurements were performed by means of the solid-state emf technique involving calcia-stabilized zirconia as electrolyte material. The temperature range covered was 1000–1350 K.

The results obtained were used to construct a diagram at 1200 K with the axes lgf(O2)-molar ratio Si/(Si+Mn) to indicate the stability ranges of the manganese silicates.

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  1. Department of Inorganic Chemistry, Umeå University, 90187, Umeå, Sweden

    J. -H. Huang & E. Rosén

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  1. J. -H. Huang
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  2. E. Rosén
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Huang, J.H., Rosén, E. Determination of Gibbs free energies of formation for the silicates MnSiO3, Mn2SiO4 and Mn7SiO12 in the temperature range 1000–1350 K by solid state emf measurements. Phys Chem Minerals 21, 228–233 (1994). https://doi.org/10.1007/BF00202136

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  • DOI: https://doi.org/10.1007/BF00202136

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