New technique to control in situ oxygen fugacity in water-free high-pressure system──Using Cu-O as an example

Through inserting a solid oxygen-specific electrolyte (YSZ) inside and exerting an electrical power of direct current outside between the sample and oxygen reservoir (an solid oxygen buffer), oxygen was driven by the power from the cathodic electrode area into the positive electrode area at high temperature and high pressure. In this way, the oxygen fugacity in the sample was in situ controlled independently of temperature and pressure. By using Cu-O system as an example, this technique was proved to be successful.

高温高压下氧逸度的就位测量与控制

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。

高压水热体系中氧逸度/活度测量与控制技术的回顾与展望

高压水热体系在科学实验、工业过程和自然界中广泛存在。氧逸度/活度是高压水热体系最基本的物理化学参数之一,经常控制着体系的物质形态、性状以及过程的发生与发展,因此对高压水热体系氧逸度/活度的测量与控制具有极为重要的意义。本文首先对目前国际上流行的各种高压水热体系氧逸度/活度测量与控制技术从原理和基本特点等方面作了详细的介绍,接着对各种技术的优、缺点作了比较与评价,文末对未来高压水热科学与技术领域氧逸度/活度测量与控制技术的发展趋势作出了展望。