Application of a solid-electrolyte oxygen fugacity sensor to high-pressure experiments

Details Application of a solid-electrolyte oxygen fugacity sensor to high-pressure experiments Application of a solid-electrolyte oxygen fugacity sensor to high-pressure experiments

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...80...49y&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 80, Issue 1-2, p. 49-64.

Physics

8

Scientific paper

To monitor the relative oxidation state, a calcia-stabilized zirconia solid-electrolyte oxygen fugacity sensor was used in high-pressure experiments in a multi-anvil type apparatus. The sensor was tested at high pressures using several combinations of common oxygen buffers, and was shown to work up to at least 7 GPa and 1350°C over a wide range of oxygen fugacities between the iron-wüstite (IW) and the magnetite-hematite (MH) oxygen buffers. Rapid responses of the e.m.f. of the sensor to the changes in P-T conditions allow us to carry out in situ oxygen fugacity measurement during high-pressure experiments. The sensor was also used to measure the relative oxygen fugacity prevailing within graphite sample capsules at conditions from 2 to 7 GPa and from 1000 to 1350°C. The redox condition within the graphite capsule is as follows: (1) with increasing temperature, relative to the wüstite-magnetite (WM) oxygen buffer, graphite becomes more reducing at constant pressure, and this causes the stable iron oxide phase in the capsule to change from magnetite to wüstite (2) this temperature dependence is, however, affected by pressure-below 3 GPa, graphite becomes more oxidizing relative to WM with increasing pressure at constant temperature, whereas above 3 GPa, it becomes less oxidizing relative to WM with increasing pressure, and this results in an enlargement of the field of graphite-wüstite coexistence. Some other applications of the sensor to high-pressure research are briefly discussed, including the in situ detection of phase transformation and pressure calibration at elevated temperature.

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