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

地球下地幔和核幔边界的含铁矿物：同步加速器穆斯堡尔源的开发和应用

• 批准号: 149731101
• 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: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/149731101?language=en
• 关键词: Iron; bearing; minerals; Earth; lower

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.

该项目涉及开发单线 NeV 同步加速器辐射源，用于极端条件下的能量分辨穆斯堡尔光谱。该光源将使我们能够在几分钟的时间内测量微米级样品的高质量穆斯堡尔光谱。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态、下地幔矿物中三价铁的自旋跃迁，以及含铁合金与核幔边界处氧化物/硅酸盐之间的化学反应的原位研究。