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The Thermodynamics of Ordered Perovskites on the CaTiO3-FeTiO3 Join |
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| Authors: | Jennifer Linton Alexandra Navrotsky Yingwei Fei |
| Institution: | Department of Geosciences and Center for High Pressure Research, Princeton University, Princeton, NJ 08544, USA, US Thermochemistry Facility and Center for High Pressure Research, Department of Chemical Engineering and Materials Science, University of California at Davis, Davis, CA 95616, USA, US Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015, USA, US |
| Abstract: | The enthalpies of formation from ilmenite, FeTiO3, and perovskite, CaTiO3, of two intermediate ordered perovskite phases, CaFeTi2O6 and CaFe3Ti4O12, have been measured at 801°C using oxide melt solution calorimetry. These data, in combination with experiments at high pressure and temperature, indicate that below 1518±50°C CaFe3Ti4O12 is stable at lower pressures (∼7 GPa at 1200°C) than CaFeTi2O6 (∼13 GPa at 1200°C). This relationship should be reversed, and CaFeTi2O6 should become stable at lower pressures than CaFe3Ti4O12, at temperatures above 1518±50°C. These intermediate phases are of petrological interest because they form as a reaction between two minerals, ilmenite and perovskite, which are commonly associated in kimberlites, and because their pressure-temperature range of formation overlaps that of origin of kimberlites. Received: 10 November 1997 / Revised; accepted: 15 January 1998 |
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