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Pressure‐induced phase transitions of vaterite, a metastable phase of CaCO3, were observed from Raman spectra and X‐ray diffraction patterns at high pressure using diamond anvil cells at room temperature. Pressure dependence of Raman peaks assignable to the symmetric stretching vibration modes of carbonate ion indicated the phase transitions of vaterite. At 4.3 GPa, vaterite (vaterite I) transformed...
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