R3: High-pressure science and deep Earth’s material

3:00 PM - 3:15 PM JST(6:00 AM - 6:15 AM UTC)

[R3-13] Velocity measurement of high-pressure ice by GHz-DAC velocity measurement method

*Ryosuke Matsui¹, Akira Yoneda¹, Izumi Mashino², Ryoma Ishida¹, Syuei Akahoshi³, Tadashi Kondo¹ (1. Graduate School of Science, Osaka University, 2. Institute for Planetary Materials, Okayama University, 3. Osaka Univ. Sci.)

Keywords:

ultrahigh pressure,sound velocity measurement,high-pressure ice

We have been developing and refining a method for measuring elastic wave velocities in samples by combining the GHz ultrasonic technique—one of the velocity measurement methods with a diamond anvil cell (DAC), a high-pressure generation device. In this study, we aimed to advance the measurement technique using this GHz-DAC acoustic method to measure sound velocities under pressures ranging from liquid H2O up to the high-pressure solid phase, ice VII. These measurements are expected to provide fundamental data essential for future subsurface exploration missions of icy planets and for discussions related to the Earth's subducting slabs.

In this presentation, we report on the applicability of the GHz-DAC acoustic method and the results of its application to actual H2O samples.