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Keywords:

  • amorphous materials;
  • calcium carbonate;
  • phase transitions;
  • Raman spectroscopy;
  • X-ray diffraction
Thumbnail image of graphical abstract

Pressed for time: Amorphous calcium carbonate (ACC) undergoes a reversible amorphous–amorphous phase transition at 10 GPa, adopting an aragonite-like local order. This result suggests a mechanism by which Mg2+—a cation with smaller ionic radius than Ca2+—modifies the local order of ACC to an aragonite-like order by helping to decrease the molar volume of the amorphous phase.