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

利用X射线计算机层析成像和高温高压吸收技术研究与地球？S内部有关的非晶态材料的体积性质。这一结果适用于与地球热演化和化学演化有关的岩浆海洋的分异、核的形成以及分凝和对流动力学。这项研究利用新的旋转砧座装置和同步辐射X射线，通过体积重建和根据比尔-朗伯定律利用X射线吸收数据来确定密度。研究人员将他们的努力集中在几种简单的、天然的硅酸盐熔体成分上，这些熔体跨越一系列聚合状态，以及Fe-S-Ni-Si熔体。在这项研究中获得的数据改善了对自然产生的熔体组成的准确状态方程所需的可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-Advance光子源运营的13-BM-D光束线上的层析成像硬件进行技术改进，以及为在高P-T条件下获取图像和在非破坏性材料表征方面具有更广泛应用的数据处理制定新的战略。

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.