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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Influence of crystallographic orientation of biogenic calcite on in situ Mg XANES analyses
Author(s): Pérez-Huerta, Alberto
Cusack, Maggie
Janousch, Markus
Finch, Adrian A
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Keywords: brachiopods
crystal lattice
Issue Date: 2008
Date Deposited: 30-Jan-2017
Citation: Pérez-Huerta A, Cusack M, Janousch M & Finch AA (2008) Influence of crystallographic orientation of biogenic calcite on in situ Mg XANES analyses. Journal of Synchrotron Radiation, 15 (6), pp. 572-575.
Abstract: Micro X-ray absorption near-edge spectroscopy at the Mg K-edge is a useful technique for acquiring information about the environment of Mg2+ in biogenic calcite. These analyses can be applied to shell powders or intact shell structures. The advantage of the latter is that the XANES analyses can be applied to specific areas, at high (e.g. micrometre) spatial resolution, to determine the environment of Mg2+ in a biomineral context. Such in situ synchrotron analysis has to take into account the potential effect of crystallographic orientation given the anisotropy of calcite crystals and the polarized nature of X-rays. Brachiopod shells of species with different crystallographic orientations are used to assess this crystallographic effect on in situ synchrotron measurements at the Mg K-edge. Results show that, owing to the anisotropy of calcite, in situ X-ray absorption spectra (XAS) are influenced by the crystallographic orientation of calcite crystals with a subsequent potentially erroneous interpretation of Mg2+ data. Thus, this study demonstrates the importance of crystallography for XAS analyses and, therefore, the necessity to obtain crystallographic information at high spatial resolution prior to spectroscopic analysis.
DOI Link: 10.1107/S0909049508026484
Rights: Authors retain the right to post an electronic version of the article on their personal website, their employer's website/repository and on free public servers in their subject area.

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