A thermogravimetric balance with a controlled atmosphere furnace and electrochemical oxygen sensor was calibrated with the oxygen buffer assemblages nickel-bunsenite and wiistite-iron and used to measure the equilibrium fO2 of the cobalt-cobalt oxide pair between 750° and 1300°C at one atmosphere pressure. The data are represented by the equation:


The total uncertainty is estimated to be ±0.08 log fO2 units. This oxygen buffer will be useful for hydrothermal experimentation where fO2 conditions slightly more reducing than those of the fayalite-magnetite-quartz buffer need to be maintained.

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