Japan Geoscience Union Meeting 2022

Presentation information

[E] Poster

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

[S-IT21] Planetary cores: Structure, formation, and evolution

Mon. May 30, 2022 11:00 AM - 1:00 PM Online Poster Zoom Room (23) (Ch.23)

convener:Hidenori Terasaki(Faculty of Science, Okayama University), convener:Eiji Ohtani(Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University), William F McDonough(Department of Earth Science and Research Center for Neutrino Science, Tohoku University, Sendai, Miyagi 980-8578, Japan), convener:Riko Iizuka-Oku(Geochemical Research Center, Graduate School of Science, The University of Tokyo), Chairperson:Hidenori Terasaki(Faculty of Science, Okayama University), Eiji Ohtani(Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University), William F McDonough(Department of Earth Science and Research Center for Neutrino Science, Tohoku University, Sendai, Miyagi 980-8578, Japan), Riko Iizuka-Oku(Geochemical Research Center, Graduate School of Science, The University of Tokyo)


11:00 AM - 1:00 PM

[SIT21-P03] Test of density measurement using X-ray absorption method combined laser-heated diamond anvil cell

*Ryo Tsuruoka1, Hidenori Terasaki2, Hiroyuki Kamina2, Seiji Kamada3,4, Tadashi Kondo1, Akira Yoneda1, Naohisa Hirao5, Saori Kawaguchi5 (1.Department of Earth and Space Science, Graduate School of Science Osaka University, 2.Department of Earth Sciences, Graduate School of Science and Technology, Okayama University, 3.Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 4.AD Science Inc., 5.JASRI)

Keywords:X-ray absorption method, density, laser-heated diamond anvil cell

Density measurement of liquid iron alloy is important to understand the planetary liquid core.
The X-ray absorption method is an effective method because it can directly determine the liquid density. We have been developing the X-ray absorption method combined with a laser-heated diamond anvil cell (DAC), and performed test measurements using Fe3C as a solid sample.

In X-ray absorption method, density of sample was obtained from measured incident and transmitted X-ray intensities of the samples using Lambert-Beer law. Fe3C sample and reference material (Ni) were loaded into each hole drilled on a pre-indented Re gasket. Al2O3 single crystal was used as pressure medium. High pressure was generated using a symmetric cell with a lever-arm frame. High temperature was generated using laser heating system. X-ray absorption measurements were conducted with monochromatic X-ray of 30 keV at BL10XU beamline in Spring-8.

The X-ray intensities of samples were measured up to 10 GPa and 1700 K. The ratio of incident and transmitted X-ray changes 0.3% from 300 K to 1700 K. The thickness of the sample was determined as 10um from X-ray intensities after quench.