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.