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Differences between Bond Lengths in Biogenic and Geological Calcite

We used high-resolution neutron powder diffraction to accurately measure the atomic positions and bond lengths in biogenic and geological calcite. A special procedure for data analysis was developed in order to take into account the considerable amounts of magnesium present in all the investigated s...

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Published in:Crystal growth & design 2010-03, Vol.10 (3), p.1207-1214
Main Authors: Zolotoyabko, E, Caspi, E. N, Fieramosca, J. S, Von Dreele, R. B, Marin, F, Mor, G, Addadi, L, Weiner, S, Politi, Y
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cited_by cdi_FETCH-LOGICAL-a323t-f2e7ec159dd24833afb19166ac1562dc88743748e075b93192bd1d14382bc0753
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container_issue 3
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container_title Crystal growth & design
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creator Zolotoyabko, E
Caspi, E. N
Fieramosca, J. S
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Mor, G
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description We used high-resolution neutron powder diffraction to accurately measure the atomic positions and bond lengths in biogenic and geological calcite. A special procedure for data analysis was developed in order to take into account the considerable amounts of magnesium present in all the investigated samples. As a result, in biogenic calcite we found some atomic bonds to have significantly different lengths as compared to those in geological calcite, after the contribution of magnesium is accounted for. The maximum effect (elongation up to 0.7%) was found for the C−O bonds. We also analyzed changes in frequencies and spectral widths of normal vibrations of carbonate groups in biogenic calcite (as compared to geological calcite) measured by Raman and Fourier transform IR techniques. Surprisingly, the frequency shifts after subtracting the magnesium contribution are close to zero. At the same time, substantial spectral broadening (up to 1.2%) in biogenic calcite as compared to geological samples was detected. Possible explanations for the experimental findings are discussed.
doi_str_mv 10.1021/cg901195t
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source American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list)
subjects Bioengineering
Biomaterials
Chemical Sciences
Condensed matter: structure, mechanical and thermal properties
Cristallography
Exact sciences and technology
Life Sciences
Neutron diffraction and scattering
Physics
Single-crystal and powder diffraction
Structure of solids and liquids
crystallography
title Differences between Bond Lengths in Biogenic and Geological Calcite
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