高温高压下氧逸度的就位测量与控制

IN SITU MEASURE AND CONTROL OF OXYGEN FUGACITY AT HIGH TEMPERATURE AND HIGH PRESSURE

通过在样品与氧库间置入一固体氧离子导体以及在样品与氧库间外加一直流电压，氧在该电压驱动下可独立于温度、压力自样品中就位抽出或灌入样品；通过在样品腔内置入一氧传感器，样品中氧逸度及其变化可得到就位监测。高温高压下样品中氧逸度由此可独立于温度、压力进行就位控制。以镍氧体系作为样品的实验表明，该方法非常成功。无疑，该方法对日后的高压实验研究具有重要的意义。

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.