Collaborative Research: Properties of Melts and Supercooled Liquids at High Pressure by In Situ X-ray Computed Tomography and Absorption

合作研究：通过原位 X 射线计算机断层扫描和吸收研究熔体和过冷液体在高压下的特性

• 批准号: 0711599
• 负责人: Charles Lesher
• 金额: $ 36.09万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0711599&HistoricalAwards=false
• 关键词: Collaborative; Research; Properties; Melts; Supercooled

The volumetric properties of non-crystalline materials relevant to Earth¹s interior are being studied using X-ray computed tomography and absorption at high pressures and temperatures. The results are applicable to differentiation of the magma ocean, core formation, and segregation and convection dynamics related to the thermal and chemical evolution of the Earth. The research utilizes the new rotating anvil apparatus and synchrotron X-ray radiation to determine density by volume reconstruction and from Beer-Lambert law using X-ray absorption data. The investigators focus their efforts on several simple and natural silicate melt compositions spanning a range of polymerization states, and on Fe-S-Ni-Si melts. Data acquired in this study improves constraints on the compressibility and thermal expansion required for an accurate equation of state for naturally occurring melt compositions. The project also includes technical improvements of tomography hardware on the 13-BM-D beamline operated by GSECARS - Advance Photon Source, Argonne National Laboratory, as well as, the development of new strategies for image acquisition at high P-T conditions and data processing with broader applications for non-destructive materials characterization.

目前正在利用X射线计算机断层摄影术和高温高压下的吸收研究与地球内部有关的非晶体物质的体积特性。这些结果对岩浆海洋的分异、地核的形成以及与地球热演化和化学演化有关的分凝和对流动力学都是适用的。 本研究利用新的旋转对顶装置和同步辐射X射线辐射，通过体积重建和利用X射线吸收数据从比尔-朗伯定律确定密度。 研究人员集中精力在几个简单的和自然的硅酸盐熔体组合物跨越一系列的聚合状态，并在Fe-S-Ni-Si熔体。 在这项研究中获得的数据提高了对自然发生的熔体组合物的准确状态方程所需的压缩性和热膨胀的约束。该项目还包括对阿贡国家实验室GSECARS -高级光子源操作的13-BM-D光束线上的层析成像硬件进行技术改进，以及开发在高P-T条件下获取图像的新策略和具有非破坏性材料表征的更广泛应用的数据处理。