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• W2022757740 endingPage "600" @default.
• W2022757740 startingPage "593" @default.
• W2022757740 abstract "Polycrystalline diamond aggregates have been synthesized by direct conversion of graphite at pressures of 12–25 GPa and temperatures 1800–2500 °C using a multianvil apparatus. The synthesized diamond was optically transparent and colorless, and was of cubic symmetry as determined by micro-focus X-ray diffraction. TEM analyses revealed that the sample consists of minute crystals of typically 10–20 nm, and only a very weak and broad band at ∼1332 cm−1 was observed by Raman spectroscopy. An indentation test demonstrated that the present polycrystalline diamond possesses a Knoop hardness of up to 140 GPa, which is equivalent to or even higher than those of natural and synthetic single-crystal diamonds (∼60–130 GPa) and nearly twice as high as those of synthetic polycrystalline diamonds containing binders (∼50–70 GPa). The present results imply that natural polycrystalline diamonds may have been formed by a rapid transformation from metastable graphite present in cold subducted crust, when encountering in warmer regions, such as rising plumes in the mantle transition region." @default.
• W2022757740 created "2016-06-24" @default.
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• W2022757740 date "2004-06-01" @default.
• W2022757740 modified "2023-09-30" @default.
• W2022757740 title "Formation of pure polycrystalline diamond by direct conversion of graphite at high pressure and high temperature" @default.
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• W2022757740 doi "https://doi.org/10.1016/j.pepi.2003.06.004" @default.
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