Development of the Single-Crystal Diamond from Chemical Vapor Deposition for the Next Generation High-Pressure Devices

EAR-0421020海姆利我们建议继续开发下一代静态超高压仪器，使样品体积增加到目前在兆巴压力下传统钻石电池中的100倍以上。这将使目前无法用于超高压研究的无数主流分析技术成为可能，包括那些成功利用即将上线的主要中子和同步辐射设施所需的技术。新型高压室还将提高现有原位探头技术的测量精度，提供经过良好校准的静水压力和均匀的温度，允许通过激光加热实现更高和更均匀的温度，并提供坚固耐用和用户友好的操作。需要这些能力来解决高压地球化学、地球物理和行星科学中的许多当前问题；因此，拟议的进展预计将在这些领域中的每一个领域产生重大影响。新电池的样品量的增加将是一系列改进的结果，包括扩大的砧座、修改的雕花形状、设计的垫圈和增加对砧座的绑定支撑。在高压和高温下合成的单晶钻石将通过同质外延化学气相沉积和单晶金刚石薄膜的过度生长来扩大，以产生高达25克拉以上的顶锤。反过来，更大的样品室将消除目前由微观体积施加的限制，并极大地改善压力-温度条件和超高压下的探测能力。将建造新的压力机，以提供更大容量所需的负荷。该项目将与新成立的地球科学材料性质研究联盟(COMPRES)协调实施，通过该联盟，高压地球科学界将获得新的高压能力。*

EAR-0421020Hemley We propose to continue the development of the next generation static ultrahigh-pressure apparatus that will allow an increase in sample volumes in excess of 100 times those currently available in conventional diamond cells at megabar pressures. This will enable myriad mainstream analytical techniques currently unavailable for ultrahigh-pressure research, including those required for the successful utilization of major neutron and synchrotron radiation facilities that are coming on line. The new class of high-pressure cells will also improve measurement accuracy for existing in situ probe techniques, provide well-calibrated hydrostatic pressures and uniform temperatures, allow higher and more uniform temperatures to be achieved with laser heating, and provide robust and user-friendly operation. These capabilities are required to address numerous current problems in high-pressure geochemistry, geophysics, and planetary science; as such, the proposed advances are expected to have major impact in each of these areas. The increases in sample volume for the new cells will result from a combination of improvements that include enlarged anvils, modified culet shapes, designed gaskets, and added binding support for the anvils. Single-crystal diamonds synthesized at high pressures and temperatures will be enlarged by homoepitaxial chemical vapor deposition overgrowth of single-crystal diamond films to create anvils reaching 25 carats and above. The larger sample chamber, in turn, will remove restrictions currently imposed by microscopic volumes and greatly improve the pressure-temperature conditions and probing capabilities at ultrahigh pressures. New presses will be built to provide the loads necessary for the larger volumes. The project will be carried out in coordination with the newly formed COnsortium for Materials Properties Research in the Earth Sciences (COMPRES), through which the new high-pressure capabilities will be made available to the high-pressure geoscience community.***