Debye temperature of gold under high pressure determined by X-ray powder diffraction method

Abstract

In order to verify pressure scales of gold, the atomic-volume dependence of Debye temperature under high pressure up to 14 GPa was measured based on Debye–Waller factor by an X-ray diffraction method. High-pressure and high-temperature X-ray powder diffraction patterns were collected by an energy-dispersive method using synchrotron radiation. The X-ray Debye temperature under high pressure was calculated from the integrated intensity ratio between the diffraction patterns collected at two different temperatures. The atomic-volume dependence of the Debye temperature obtained in the present study was consistent with that predicted by a first-principles calculation, in which Debye temperature and Grüneisen parameter of the volume at ambient condition were Θ D 0 = 180 K and γ 0 = 3.16 , respectively.