Acoustic velocities of synthetic ACC up to 20 GPa by Brillouin spectroscopy
Acoustic longitudinal and transverse velocities of amorphous calcium carbonate with different H2O contents as function of pressure up to 20 GPa. The velocities were obtained by Brillouin scattering experiments during compression and decompression experiments in Bohler Almax diamond anvil cells. ACC-I:7wt% H2O; ACC-II:1wt% H2O; ACC-III:18wt% H2O
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Amorphous calcium carbonate (ACC) samples (ACC-I, ACC-II and ACC-III) were obtained using the synthesis procedures of Koga et al. (1998) and Faatz et al. (2004). Samples ACC-I and ACC-II were heat treated in order to remove H2O from the samples. We performed Brillouin scattering experiments in forward symmetric scattering geometry on the three different samples. The samples were loaded in Bohler Almax diamond anvil cells using Ne as pressure transmitting medium. Compression and decompression experiments were performed up to 20 GPa.