Experimental Investigations of Solid-Liquid Boundary in the Earth's Core

铁-轻元素-合金体系中熔化的热力学和动力学对于理解地核的热化学演化具有重要意义。本文的目的是研究高压下Fe-O-S三元体系固液边界附近的相关系。这一目标将通过多砧试验、淬火运行产品分析和原位同步辐射测量来实现。实验将进行1)建立和理解压强的依赖关系的共晶温度Fe-O-S三元系统,2)确定共晶成分Fe-O-S系统压力的函数,3)测试关闭的混溶隙Fe-rich部分Fe-O-S三进制以上25 GPa,和4)探索synchrotron-based方法原位测定的共晶点温度和成分Fe-O-S系统。这些结果将用于测试Fe-O-S系统是否是地核组成的适当模型，并为地核组成和温度提供进一步的限制。该项目将支持早期职业女性PI在伊利诺伊大学厄巴纳-香槟分校开发高压研究基础设施。该项目将包括研究生和本科生的培训。

LiEAR-0337612Thermodynamics and kinetics of melting in the Fe-light element-alloy systems are important for understanding the thermal and chemical evolution of the Earth's core. The goal of this proposal is to investigate phase relations near the solid-liquid boundary in the Fe-O-S ternary system under high pressures. This goal will be achieved through multi-anvil experiments combined with analyses of the quenched run products and in situ synchrotron measurements. Experiments will be conducted 1) to establish and understand the pressure dependence of the eutectic temperature in the Fe-O-S ternary system, 2) to determine the eutectic composition in the Fe-O-S system as a function of pressure, 3) to test the closure of the miscibility gap in the Fe-rich portion of the Fe-O-S ternary system above 25 GPa, and 4) to explore a synchrotron-based method for in situ determination of temperature and composition of eutectic point in the Fe-O-S system. The results will be used to test whether or not the Fe-O-S system is an adequate model for the core composition, and to provide further constraints on the composition and temperature of the Earth's core. This project will support the early-career female PI in developing the infrastructure for high-pressure research at the University of Illinois-Urbana-Champaign. The project will involve the training of graduate and undergraduate students.