Iron-bearing minerals in Earth's lower mantle and core-mantle boundary: Development and application of a synchrotron Mössbauer source

该项目包括开发一种用于极端条件下能量分辨穆斯堡尔谱学的单线近地同步辐射源。该光源将允许我们在几分钟的时间内测量微米级样品的高质量穆斯堡尔谱。快速数据收集将能够在地球深处的条件下(压力大于100 Gpa，温度高达3000 K)测量材料中铁的电子结构。我们将应用该技术研究下地幔矿物中铁的氧化状态，下地幔矿物中铁的自旋转变，以及核幔边界含铁合金与氧化物/硅酸盐之间的化学反应的原位研究。

The project involves the development of a single-line neV-wide source of synchrotron radiation for energy-resolved Mössbauer spectroscopy at extreme conditions. The source will allow us to measure high quality Mössbauer spectra of samples at the micron scale within a time span of a few minutes. The rapid data collection will enable the measurement of the electronic structure of iron in materials at conditions of those within the deep Earth (pressures greater than 100 GPa and temperatures up to 3000 K). We will apply the technique to study the oxidation state of iron in lower mantle minerals, spin transitions involving ferric iron in lower mantle minerals, and in situ investigations of chemical reactions between iron-bearing alloys and oxides/silicates at the core-mantle boundary.