The heat-capacity of ilmenite and phase equilibria in the system Fe-T-O

Details The heat-capacity of ilmenite and phase equilibria in the system Fe-T-O The heat-capacity of ilmenite and phase equilibria in the system Fe-T-O

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.2027a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 49, Issue 10, pp.2027-2040

Other

9

Scientific paper

Low temperature adiabatic calorimetry and high temperature differential scanning calorimetry have been used to measure the heat-capacity of ilmenite (FeTiO 3 ) from 5 to 1000 K. These measurements yield S 298 0 = 108.9 J /( mol · K ). Calculations from published experimental data on the reduction of ilmenite yield 298 0 ( I 1) = -1153.9 kJ /( mol · K ). These new data, combined with available experimental and thermodynamic data for other phases, have been used to calculate phase equilibria in the system Fe-Ti-O. Calculations for the subsystem Ti-O show that extremely low values of f O 2 are necessary to stabilize TiO, the mineral hongquiite reported from the Tao district in China. This mineral may not be TiO, and it should be re-examined for substitution of other elements such as N or C. Consideration of solid-solution models for phases in the system Fe-Ti-O allows derivation of a new thermometer/oxybarometer for assemblages of ferropseudobrookite-pseudobrookite ss and hematite-ilmenite ss . Preliminary application of this new thermometer/oxybarometer to lunar and terrestrial lavas gives reasonable estimates of oxygen fugacities, but generally yields subsolidus temperatures, suggesting re-equilibration of one or more phases during cooling.

Affiliated with

Also associated with

No associations

Rating

The heat-capacity of ilmenite and phase equilibria in the system Fe-T-O does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The heat-capacity of ilmenite and phase equilibria in the system Fe-T-O, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The heat-capacity of ilmenite and phase equilibria in the system Fe-T-O will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1546137