Mechanochemical synthesis of nanocrystalline carbonate-substituted hydroxyapatite
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Carbonate-substituted hydroxyapatite has been produced by solid-state reactions using a mechanochemical synthesis method. Ammonium phosphate monobasic and calcium carbonate were used as raw materials. Mixtures of the initial powders were prepared using a Ca/P molar ratio similar to that of non-substituted hydroxyapatite, Ca10(PO4) 6(OH)2. Dry milling of the powders was performed by using a ball to powder weight ratio equals 20:1. The obtained product was characterized by means of infrared spectroscopy, transmission electron microscopy and X-ray diffraction. Under the employed synthesis conditions hydroxyapatite is obtained after 2 h of milling. The crystallinity and the amount of the hydroxyapatite increase as milling time does. After milling for 6 h, nanosized apatite which has a possible composition Ca9%2by(CO 3)(PO4)5(OH)1%2b2y is obtained. © 2004 Elsevier B.V. All rights reserved.
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Biomaterial; Hydroxyapatite; Mechanosynthesis Biomaterials; Carbonates; Composition; Infrared spectroscopy; Nanostructured materials; Phosphates; Synthesis (chemical); Thermogravimetric analysis; Transmission electron microscopy; X ray diffraction; Dry milling; Mechanosynthesis; Powder weight ratio; Solid-state reactions; Hydroxyapatite
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