Electronic structure of Fe/Mg carbonates at conditions of the Earth's lower mantle: Implications for the formation of tetrahedrally coordinated carbon

地球下地幔条件下铁/镁碳酸盐的电子结构：对四面体配位碳形成的影响

• 批准号: 390954243
• 负责人: Dr. Christian Sternemann
• 金额: --
• 依托单位: Lehrstuhl für Experimentelle Physik I
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/390954243?language=en
• 关键词: Electronic; structure; Fe; Mg; carbonates

In this project we would like to study and describe the electronic structure of Fe in high-pressure, high-temperature tetra-carbonate phases by in situ studies of these compounds exploiting K-beta and Valence-to-Core x-ray emission spectroscopy, complemented by X-ray Raman scattering measurements. We will focus on the spin and valence state of iron, the co-existence of iron in high- and low spin-state and the influence of the ligands on the electronic structure. Furthermore, relations to the structural properties of Ca or Mg will be investigated. By combination of Valence-to-Core emission spectroscopy and X-ray Raman scattering with results from x-ray diffraction and Mössbauer spectroscopy we will constrain possible reaction paths that lead into formation of tetra-carbonate phases and assess implications for carbonates in the Earth's lower mantle.

在这个项目中，我们想研究和描述的高压，高温四碳酸盐相的铁的电子结构，这些化合物的原位研究，利用K-β和价核X射线发射光谱，辅以X射线拉曼散射测量。我们将着重讨论铁的自旋和价态，铁在高自旋态和低自旋态的共存以及配体对电子结构的影响。此外，将研究与Ca或Mg的结构性质的关系。结合价核发射光谱和X射线拉曼散射与X射线衍射和穆斯堡尔谱的结果，我们将限制可能的反应路径，导致形成四碳酸盐相，并评估地球下地幔碳酸盐的影响。