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
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.
- Publication:
-
Physics and Chemistry of Minerals
- Pub Date:
- August 1994
- DOI:
- 10.1007/BF00202136
- Bibcode:
- 1994PCM....21..228H