High pressure generation in Kawai-type multianvil apparatus using nano-polycrystalline diamond anvils |
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| Institution: | 1. Geodynamics Research Center, Ehime University, 790-8577 Matsuyama, Japan;2. Earth and Life Science Institute, Tokyo Institute of Technology, 152-8550 Tokyo, Japan;3. Japan Synchrotron Radiation Research Institute, SPring-8, 679-5198 Hyogo, Japan |
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| Abstract: | Nano-polycrystalline diamond cubes with an edge length of 6 mm have been used as anvils for Kawai-type multianvil apparatus. The maximum pressure of ～88 GPa was confirmed based on in situ X-ray diffraction measurements using nano-polycrystalline diamond anvils with a truncation of 1.0 mm, which is more than 50% higher than the pressure (～56 GPa) achieved at the same press load using sintered-diamond anvils. The X-ray transparency of the nano-polycrystalline diamond anvil was found to be about 10–100 times as high as that of sintered-diamond anvils for a wide range of photon energies (～30–130 keV), leading to high-quality X-ray imaging and diffraction profiles of the sample under pressure, even through the anvils. It is expected that further optimization of the pressure medium and gasket would lead to pressures far higher than 100 GPa without sacrificing the advantages of the multianvil apparatus over diamond anvil cells. |
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| Keywords: | Kawai-type multianvil apparatus (KMA) Nano-polycrystalline diamond (NPD) Sintered diamond (SD) Anvil material Ultra-high pressure generation |
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