Rhombohedral Oxide

Thermodynamic Properties of Rhombohedral Oxide Solid Solutions with general formula (Fe,Mg,Mn)TiO3-Fe2O3

  1. Calculate Wt % oxides from mole fractions of endmembers.
  2. Calculate mole fractions of endmembers from Wt % oxides.
  3. Calculate thermodynamic properties from mole fractions of endmembers, T and P.
TiO2 Fe2O3 FeO MnO MgO
Wt % oxides:
Geikielite
MgTiO3		 Hematite
Fe2O3		 Ilmenite
FeTiO3		 Pyrophanite
MnTiO3
Mole Fraction:

Calculation of Thermodynamic Properties require specification of temperature (T) and Pressure (P)

Input a temperature (C): .
Input a pressure (bars): .
Action: results or the form.

Ghiorso MS (1990) Thermodynamic properties of hematite-ilmenite-geikielite solid solutions. Contributions to Mineralogy and Petrology 104, 645-667.

Ghiorso MS, Sack RO (1991) Fe-Ti oxide geothermometry: thermodynamic formulation and the estimation of intensive variables in silicic magmas. Contributions to Mineralogy and Petrology 108, 485-510.