[S-MP33] Physics and Chemistry of Minerals

[SMP33-16] DAC-GHz ultrasonic P wave velocity measurement on KCl and natural olivine

*Akira Yoneda¹, Shinichiro Kobayashi², Seiji Kamada³ (1.Institute for planetary materials, Okayama University, 2.Department of Earth Science, Graduate school of Science, Tohoku Univ., 3.Frontier Research Institute for Interdisciplinary Sciences, Tohoku Univ.)

Keywords:elasticity, DAC, GHz ultrasonics

GHz ultrasonic velocity measurements has been developed up to 14 GPa in diamond anvil cell (DAC). In order for GHz ultrasonic measurement, both P and S wave buffer rods were manufactured through sputtering ZnO piezoelectric film on single crystal rods, such as sapphire, rutile, and YAG. Several technical breakthroughs were achieved before observing stable signals from the specimen squeezed in DAC: (1) Wiping by aqueous ammonia on the contact surfaces enhances transmissibility of GHz wave from buffer rod to diamond. (2) Cleaning by lathery detergent and water jet is effective to remove sticky staff on rear surface of diamond. (3) Steel ball supporter provides easier adjustment of contact between buffer rod and diamond. Consequently, we succeeded to demonstrate performance of DAC-GHz system through KCl and natural olivine samples.