Structural incorporation of MgCl₂ into ice VII at room temperature

Abstract

  Recently, it is reported that ice VII can incorporate salt into its crystal structure. In this study, we investigated incorporation of MgCl₂ into crystal structure of ice VII. Pressure was applied to MgCl₂ solution up to 6 GPa using diamond anvil cell (DAC) at room temperature and X-ray diffraction pattern and Raman spectra were obtained. Phase boundary between ice VII and ice VIII and OH stretching frequency of ice VII suggested the incorporation of MgCl₂ into crystal structure of ice VII.