期刊
SCIENCE ADVANCES
卷 2, 期 7, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.1600341
关键词
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资金
- German Research Foundation [Deutsche Forschungsgemeinschaft (DFG)]
- Federal Ministry of Education and Research (BMBF
- Germany) for financial support through the DFG Heisenberg Programme [DU 954-6/1, DU 954-6/2, DU 954-8/1]
- BMBF [5K13WC3]
- BMBF (Germany)
- NSF Earth Sciences [EAR-1128799]
- U.S. Department of Energy (DOE) GeoSciences [DE-FG02-94ER14466]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- Ministry of Science and Education of Russian Federation [14.Y26.31.0002]
Studies of materials' properties at high and ultrahigh pressures lead to discoveries of unique physical and chemical phenomena and a deeper understanding of matter. In high-pressure research, an achievable static pressure limit is imposed by the strength of available strong materials and design of high-pressure devices. Using a high-pressure and high-temperature technique, we synthesized optically transparent microballs of bulk nanocrystalline diamond, which were found to have an exceptional yield strength (similar to 460 GPa at a confining pressure of similar to 70 GPa) due to the unique microstructure of bulk nanocrystalline diamond. We used the nanodiamond balls in a double-stage diamond anvil cell high-pressure device that allowed us to generate static pressures beyond 1 TPa, as demonstrated by synchrotron x-ray diffraction. Outstanding mechanical properties (strain-dependent elasticity, very high hardness, and unprecedented yield strength) make the nanodiamond balls a unique device for ultrahigh static pressure generation. Structurally isotropic, homogeneous, and made of a low-Z material, they are promising in the field of x-ray optical applications.
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