Reciprocal-space imaging and the use of a diamond-anvil cell: a single-crystal high-pressure study of a quasicrystal up to 10.7 GPa

Abstract

A comparative in-situ high-pressure single-crystal X-ray diffraction study of decagonal Al 70 Co 12 Ni 18 (Edagawa phase) up to 10.7 GPa has been performed using a diamond-anvil cell with Mo Kα 1 X-rays as well as synchrotron radiation. A method of quantitative reciprocal-space reconstruction from image plate frames was used for data analysis. Although a diamond-anvil cell was used for pressure generation, very clear low-background images, comparable with those without a diamond-anvil cell were obtained. Neither Bragg scattering nor diffuse scattering show any variation with pressure, indicating the high stability of the decagonal quasicrystal structure. The compression behaviour was found to be quasiisotropic in the investigated pressure range. The bulk modulus at zero pressure was determined as 121(8) GPa.