[SMP36-P05] Density and elastic properties of liquid gallium using externally heated diamond anvil cell
Keywords:gallium, diamond anvil cell, X-ray absorption method
In X-ray absorption method, density of liquid Ga was obtained from measured incident and transmitted X-ray intensities of the samples using Lambert-Beer law (Takubo et al. 2019). Ga sample and two reference materials (RbBr, KBr, or Fe) were loaded into each hole drilled on a pre-indented Re gasket. The Re gasket was coated with Al2O3 to avoid a reaction between the Ga sample and the gasket. High pressure was generated using a symmetric DAC with a lever-arm frame. High temperature was generated using external heaters composed of Pt-Rh wires with a ZrO2 insulator. X-ray absorption measurements were conducted with monochromatic X-ray of 30 keV at BL10XU and BL22XU beamlines in SPring-8.
The density of liquid Ga were measured up to 10 GPa and 533 K. The elastic properties (bulk modulus (KT0), its pressure derivative (K')) of liquid Ga were calculated by fitting the density data with equations of state (EOSs) and obtained 45.8(4) GPa, 6.1(2) from third-order Birch-Murnaghan EOS at 500 K, respectively. In lower pressure region, the compression curve is consistent with the density calculated from sound velocity data reported by Ayrinhac et al. (2015). However, our results show that density variation is smaller than Ayrinhac et al. (2015) in higher pressure (e.g. 1% smaller at 10 GPa).