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Licensed Unlicensed Requires Authentication Published by De Gruyter January 3, 2017

Raman and IR studies of the effect of Fe substitution in hydroxyapatites and deuterated hydroxyapatite

Anastasios Antonakos, Efthymios Liarokapis, Andreas Kyriacou and Theodora Leventouri
From the journal American Mineralogist

Abstract

We have studied synthetic Fe-substituted hydroxyapatite Ca5-xFex(PO4)3OH and the corresponding deuterated samples with varying Fe concentrations x (0 ≤ x ≤ 0.3) by Raman and IR spectroscopy at room temperature. In the IR spectra, substitution of deuterons for protons affects the OH internal mode in a way consistent with the mass difference of the substituting ions, as well as a mode attributed to vibrations of the Ca3-(OH) unit. In the Raman spectra, the frequency of all modes is not noticeably affected by the Fe substitution. Raman bands show increased width and substantial reduction in intensity with increasing amount of Fe, presumably related to disorder introduced by the substitution. We find that the disorder is smaller in the hydroxyapatites compared to the deuterated ones.

Acknowledgements

Crystal structure and electron microscopy studies had been conducted at the Oak Ridge National Laboratory’s High Flux Isotope Reactor and the Center for Nanophase Materials Sciences, sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. Preparation and characterization of the samples was supported by FAU’s “Dissertation of the Year Award” to the third author.

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Received: 2016-6-17
Accepted: 2016-8-29
Published Online: 2017-1-3
Published in Print: 2017-1-1

© 2017 by Walter de Gruyter Berlin/Boston