Structure, properties and high-pressure and high-temperature behaviour of iron oxides with implications for the structure and dynamics of the Earth`s lower mantle and core

尽管经过几十年的研究，FeO、Fe3O4和Fe2O3的结构、性质以及高压和高温行为仍然存在争议。它们作为地球吸积过程中的潜在阶段以及当今地幔阶段的组成部分对地球科学的重要性促使人们对它们在高压和高温下的性质和相图进行新的研究。使用新开发的金刚石压砧单元和我们的激光加热设备中的电阻加热系统，将使用大范围的互补技术（穆斯堡尔，拉曼和红外光谱，X射线衍射和电阻率测量）对样品进行研究。使用新开发的设备进行的初步实验证实，可以成功克服压力梯度和缓慢动力学等实验挑战，从而实现确定FeO，Fe3O4和Fe2O3高压相的结构和电子性质的目标，这些高压相在地球下地幔的压力和温度条件下稳定。

The structure, properties and high-pressure and high-temperature behaviour of FeO, Fe3O4 and Fe2O3 remain controversial, despite several decades of research. Their importance to the geosciences as potential phases during the Earth´s accretion as well as components of present day mantle phases motivates a new examination of their properties and phase diagrams at high pressures and temperatures. Using a newly developed system for resistive heating in the diamond anvil cell and our laser heating facility, samples will be studied using a large range of complementary techniques (Mössbauer, Raman and infrared spectroscopies, X-ray diffraction, and electrical resistivity measurements). Preliminary experiments using the newly developed apparatus have confirmed that experimental challenges such as pressure gradients and sluggish kinetics can be successfully overcome, enabling the goal of identifiying the structure and electronic properties of the high-pressure phases of FeO, Fe3O4 and Fe2O3 that are stable at the pressure and temperature conditions of the Earth´s lower mantle to be realised.