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. 2019 Apr 11;20(7):1790. doi: 10.3390/ijms20071790

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Chemical and crystallographic characterization of hydroxyapatite (HA) and poorly crystalline calcium deficient hydroxyapatite (CDHA) particles synthesized and heat-treated at 900 °C. (a,c) FTIR spectra; (b,d) XRD patterns.