In-Situ Measure and Control of Oxygen Fugacity at High-Temperature and High-Pressure

By inserting a solid oxygen-specific electrolyte between a sample and an oxygen reservoir, and applying a DC power between the oxygen reservoir and the sample oxygen can be pumped out from or poured into the sample in situ independent of temperature and pressure. By installing an oxygen sensor into the sample cell, the oxygen fugacity in the sample can be monitored in situ. In this way, the oxygen fugacity in the sample can be conveniently controlled in situ independent of temperature and pressure. Our experiments in which a Ni-O system was used as the sample show that this method is very successful. Undoubtedly, the method is of great significance to high-pressure experimental studies.