Study of synthetic and biogenic Vaterite from low to high temperature
Calcium carbonate is a material largely diffuse in nature as geological mineral and as biological phase. Despite the minor stability, vaterite is the principal polymorph in the biological systems. The hexagonal structure of vaterite is reported to have the CO32- disordered on three sites around the three-fold axis. From an unpublished thermal expansion experiment on biogenic and synthetic vaterite samples, we have noticed that: (1) The thermal expansions are different in the two sample; (2) it is possible to highlight a change in the slope of the thermal expansions curves of the two samples at about 150°C; (3) the thermal expansion is anisotropic. We propose to collect neutron powder diffraction patterns on synthetic and biogenic vaterite from in the between 150-525 K in order to study different features of vaterite: (1) Accurate determination to the atomic positions; (2) super-structure determination (3) study of the thermal expansion of vaterite on an extended temperature range; (4) determination of the thermal ellipses of the oxygen atoms to understand their role in the thermal expansion anisotropy; (5) understanding difference between synthetic and biogenic vaterite.
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davide levy; BRUNELLI Michela; FITCH Andrew and SUARD Emmanuelle. (2015). Study of synthetic and biogenic Vaterite from low to high temperature. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-565
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