High Pressure Melting of the Earth's Core Material

Shen 0001149该提案是使用激光加热金刚石对顶室与第三代同步加速器X射线微束耦合，开始一系列高压熔化实验。这项工作将提供地球核心的主要成分（Fe，FeO，FeS和Fe-Ni-O-S系统）在相当于地球核心压力下的熔化数据。这一研究结果将对地球的热状态和动力学过程具有重要意义。实验将在芝加哥高级光子源（APS）的GeoSoilEnviroCARS（GSECARS）进行。一个新开发的激光加热金刚石砧座（DAC）系统将用于产生一个样品体积（约20毫米的尺寸）在压力为250 GPa和足够高的温度熔化（4000 K）。将使用具有微X射线束（~5 mm）的原位X射线衍射作为熔融测定的探针。该提案汇集了高压DAC技术和新的第三代同步辐射（APS）的专业知识，非常适合研究高压熔化的长期问题。

Shen 0001149 This proposal is to begin a series of high pressure melting experiments using the laser heated diamond anvil cell coupled with the third generation synchrotron x-ray micro-beam. This work will provide melting data on major components of the Earth's core (Fe, FeO, FeS, and Fe-Ni-O-S system) to pressures equivalent to those present in the Earth's core. The results of this study will have important implications for the Earth's thermal state and dynamic processes. Experiments will be performed at GeoSoilEnviroCARS (GSECARS) at the Advanced Photon Source (APS), Chicago. A newly developed laser heated diamond anvil cell (DAC) system will be used for generating a sample volume (~20 mm in dimension) at pressures to 250 GPa and sufficiently high temperatures for melting (4000 K). In situ x-ray diffraction with micro x-ray beams (~5 mm) will be used as a probe for melting determination. This proposal brings together expertise in the high pressure DAC technique and the new third generation synchrotron radiation (APS) which is ideally suited to study the long-standing problem of high pressure melting.