✦ LIBER ✦
Determination of Gibbs free energies of formation for the silicates MnSiO3, Mn2SiO4and Mn7SiO12in the temperature range 1000–1350 K by solid state emf measurements
✍ Scribed by J. -H. Huang; E. Rosén
- Publisher
- Springer-Verlag
- Year
- 1994
- Tongue
- English
- Weight
- 599 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0342-1791
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✦ Synopsis
Standard Gibbs free energies of formation (AIG ~ for the minerals rhodonite (MnSiO3), tephroite (Mn2SiO4) and braunite (MnySiO12) have been determined by measuring the oxygen fugacities of the following redox equilibria:
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.