Vibrational study of the role of Mg2+ in the increased thermodynamic stability of Mg2+-doped amorphous calcium carbonate
Calcium carbonate (CaCO3) is a widely studied inorganic compound very abundant in nature as a mineral and a bio-mineral. In recent years, it has been observed that the formation of stable crystalline polymorphs of CaCO3 is preceded by the precipitation of an amorphous phase -Amorphous Calcium Carbonate (ACC)-, which contains structural water. ACC is found in the first steps of formation of many organisms. ACC usually contains a small weight fraction of some organic and inorganic additives, whose role is not yet fully understood. One of them, Mg2+, is also known to play a role as stabilizer of the amorphous structure, preventing its crystallization. Here we will test whether this stabilization mechanisms is mediated by enhanced strength of hydrogen bonding of water molecules. The residence time of water in Mg2+ is longer, and thus it is expected that this makes Mg2+-doped ACC more persistent. The IINS technique is perfectly suited to study water librational modes, whose frequencies should be affected in the case of stiffer hydrogen bonding network as the one hypothesized for Mg2+-doped ACC.
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FERNANDEZ MARTINEZ Alejandro; BATAILLE Benjamin; CUELLO Gabriel; JIMENEZ RUIZ Monica; KAISHI Ayuki and WAYCHUNAS Glenn. (2013). Vibrational study of the role of Mg2+ in the increased thermodynamic stability of Mg2+-doped amorphous calcium carbonate. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-04-123
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