Experimental Determination of the Melting Temperature and Structure of Carbon and Fe-compounds at High Pressure

本项目是由美国国家科学基金EAR85-18138资助的关于地球材料淬火熔体熔融行为和结构的高压实验研究的延续。通过在金刚石砧高压电池中聚焦激光加热样品，可以实现高达300千巴和6000千巴的压力-温度条件。样品温度由热发射率的连续光谱分析确定；压力由红宝石荧光技术测定。该项目的具体目标包括完成碳在高压下熔化曲线的测定，并开始（mg,Fe）O和（mg,Fe） SiO3（钙钛矿）的熔化研究。这些研究结果将为研究地球材料的淬火熔体的行为提供重要的信息。

This project represents a continuation of research previously supported by NSF grant EAR85-18138 concerning high-pressure experimental studies of the melting behavior and structure of quenched melts of Earth materials. Pressure-temperature conditions up to 300 kilobars and 6000>K are achieved by focussed laser heating of samples in a diamond-anvil high pressure cell. Sample temperatures are determined by continuous-spectrum analysis of thermal emissivity; pressure is determined by the ruby-fluorescence technique. Specific objectives of the project include completion of the determination of the melting curve of carbon at high pressure and initiation of melting studies of (mg,Fe)O and (Mg,Fe)SiO3 (perovskite). The results of these studies will provide important information on the behavior of quenched melts of Earth materials.