Japan Geoscience Union Meeting 2014

Presentation information

Oral

Symbol S (Solid Earth Sciences) » S-IT Science of the Earth's Interior & Techtonophysics

[S-IT39_2AM2] Deep Earth science: Dynamics of plate, mantle, and core

Fri. May 2, 2014 11:00 AM - 12:45 PM 416 (4F)

Convener:*Shingo Watada(Ocean Hemisphere Research Center, Earthquake Research Institute, University of Tokyo), Takeshi Sakai(Geodynamics Research Center, Ehime University), Takashi Nakagawa(JAMSTEC/IFREE), Chair:Kenji Kawai(Department of Earth and Planetary Sciences, Tokyo Institute of Technology)

12:15 PM - 12:30 PM

[SIT39-P07_PG] Ultra high pressure generation using the double-stage diamond anvil cell

3-min talk in an oral session

*Takeshi SAKAI1, Takehiko YAGI1, Hiroaki OHFUJI1, Tetsuo IRIFUNE1, Yasuo OHISHI2, Naohisa HIRAO2, Yuya SUZUKI3, Yasushi KURODA3, Takayuki ASAKAWA3, Takashi KANEMURA3 (1.Geodynamics Research Center, Ehime University, 2.Japan Synchrotron Radiation Research Institute, 3.HITACHI High-Technologies)

Keywords:nano-polycrystalline diamond (NPD), microanvil

1 TPa region is still far frontier for the high pressure physics. The maximum pressure generated by diamond anvil cell is about 400 GPa (Akahama and Kawamura, 2010). On the other hand, recently Dubrovinsky et al. (2012) reported the generation of 640 GPa using double stage diamond anvil cell. This new technique makes 1TPa reagion a realistic goal for static compression experiments. But there are some technical difficulties such as a second-stage anvil's shape controllability, shift under pressure, and the difficulty of a sample filling. These problems depress the reproducibility of experiment. In this study, second-stage microanvils were made by focused ion beam system from the nano-polycrystalline diamond (NPD) or single crystal (SC) diamond. Micro manufacturing using focused ion beam system enables us to control anvil shape, process any materials (NPD, SC and also sample), and fill the sample between the second-stage anvil gap precisely. Using this method, we generated up to 340 GPa. This method has a high reproducibility of the experiment. Thus, we can optimize the experimental parameters such as an anvil shape, confining pressure and so on.