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

[SIT03-P02] 高温高圧下における金の単結晶弾性の測定

*米田 明¹、福井 宏之²、平尾 直久³、鎌田 誠司⁴、バロン アルフレッド⁵ (1.岡山大地球研、2.兵庫県立大、3.高輝度光科学研究センター、4.東北大学大学院理学研究科、5.理化学研究所)

キーワード：金, 単結晶, 弾性, 高圧

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.