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

铁氧化物的结构、性质以及高压和高温行为对地球下地幔和地核的结构和动力学的影响

• 批准号: 5410914
• 负责人: Privatdozentin Dr. Catherine McCammon
• 金额: --
• 依托单位: Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik (BGI)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5410914?language=en
• 关键词: Structure; properties; pressure; temperature; behaviour

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.

尽管经过了几十年的研究，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相以及当今地幔相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特性和相图进行新的研究。使用新开发的金刚石砧室电阻加热系统和我们的激光加热设备，将使用多种互补技术（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。使用新开发的装置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，从而实现识别在地幔下地幔压力和温度条件下稳定的FeO、Fe3O4和Fe2O3高压相的结构和电子性质的目标。