title: Note: high-pressure generation using nano-polycrystalline diamonds as anvil materials.
abstract: Nano-polycrystalline diamonds (NPDs) consist of nanosized diamond grains oriented in random directions. They have high toughness and isotropic mechanical properties. A NPD has neither the cleavage feature nor the anisotropy of hardness peculiar to single-crystal diamonds. Therefore, it is thought to be useful as a diamond anvil. We previously reported the usefulness of a NPD as an anvil for high-pressure development. In this study, some additional high-pressure generating tests using diamond anvils of various shapes prepared from NPDs were conducted to investigate the advantage of using NPDs for anvil applications. The results revealed that the achievable pressure value of a NPD anvil with a culet size of more than 300 μm is about 1.5 to 2 times higher than that of single-crystal diamond anvils, indicating that NPD anvils have considerable potential for large-volume diamond anvils with large culet sizes.
authors: KYOKUGEN, Center for Quantum Science and Technology under Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531, Japan.
authors: Y
authors: Y
authors: Nakamoto
authors: M
authors: M
authors: Sakata
authors: H
authors: H
authors: Sumiya
authors: K
authors: K
authors: Shimizu
authors: T
authors: T
authors: Irifune
authors: T
authors: T
authors: Matsuoka
authors: Y
authors: Y
authors: Ohishi