In-Situ Control of Oxygen Fugacity in Water-Free Systems at High Temperature and High Pressure

By using two oxygen specific electrolyte discs and applying a dc voltage between the sample and an oxygen buffer, oxygen can be driven into or pumped from the sample at a fixed temperature and pressure. By measuring the voltage between the sample and a reference buffer, the oxygen fugacity in the sample is simultaneously monitored. Therefore, the oxygen fugacity in the sample at high temperature and high pressure can be in situ controlled independently of temperature and pressure.