Japan Geoscience Union Meeting 2015

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International Session (Oral)

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

[S-IT03] Structure and dynamics of Earth and Planetary deep interiors

Tue. May 26, 2015 11:00 AM - 12:45 PM 106 (1F)

Convener:*Takashi Yoshino(Institute for Study of the Earth's Interior, Okayama University), Satoru Tanaka(Department of Deep Earth Structure and Dynamics Research Japan Agency for Marine-Earth Science and Technology), Dapeng Zhao(Department of Geophysics, Tohoku University), Masanori Kameyama(Geodynamics Research Center, Ehime University), John Hernlund(Earth-Life Science Institute, Tokyo Institute of Technology), Chair:Satoru Tanaka(Department of Deep Earth Structure and Dynamics Research), Kenji Kawai(Department of Earth Science and Astronomy, Graduate School of Arts and Sciences, University of Tokyo)

12:00 PM - 12:03 PM

[SIT03-P02] Measurement of single crystal elasticity of Gold (Au) under high temperature and high pressure

3-min talk in an oral session

*Akira YONEDA1, Hiroshi FUKUI2, Naohisa HIRAO3, Seiji KAMADA4, Alfred BARON5 (1.ISEI, Okayama Univ., 2.Univ. of Hyougo, 3.JASRI, 4.Graduate school of Science, Tohoku University, 5.RIKEN)

Keywords:Gold, single crystal, elasticity, high pressure

Single crystal elasticity of gold (Au) has been measure by inelastic X ray scattering method under high pressure. A few tens micrometer Au single crystal was prepared from a large commercial crystal by using FIB technique. The small crystal was placed inside a gasket hole of DAC apparatus. We succeeded to measure single crystal elasticity at 0.8 GPa and 3.2 GPa; the pressures were determined by the Ruby scale. ~100 peaks were observed at each pressure, and used to constrain the three independent constants of C11, C12, and C44. The resulted elastic constants are consistent with the previous data at ambient pressure.
We observed that C11 and C44 increase with increasing pressure, and C12 decreases with increasing pressure. We will expand the pressure range and temperature range of the measurement to establish the equation of state of gold with unprecedented accuracy.