NEW TECHNIQUE TO CONTROL OXYGEN FUGACITY IN HIGH-TEMPERATURE HIGH-PRESSURE EXPERIMENTS/

A new method to control oxygen fugacity in high-temperature/high-press ure experiments is proposed. In this method, use is made of two connec ted oxygen membrane cells which monitor and regulate the oxygen fugaci ty in the sample. As an example, all of the possible oxidation states in the Ni-O system were achieved. This method will provide a powerful tool in research on the chemistry of high-temperature/high-pressure en vironments such as the interior of the Earth. (C) 1998 American Instit ute of Physics.