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Preparation of calcium strontium hydroxyapatites by a new route involving calcium phosphate cements
The results show that it is possible to prepare and to shape apatites containing strontium at low temperatures by the ionic cements route. All the apatites are coherent, homogeneous, and solid. When the (Ca+Sr)/P atomic ratio is equal to 1.67 and the Sr/(Sr+Ca) atomic ratio varies in the range 0 to 0.10, the solid obtained is mainly composed of a mixed Ca-Sr hydroxyapatite. Its chemical formula is Ca(10-x)Sr(x)(PO4)6(OH)2 with 0 < = x < 1. When the (Ca+Sr)/P atomic ratio is equal to 1.67 and the Sr/(Sr+Ca) atomic ratio varies in the range 0.10 to 0.20, the cement is composed of a mixed calcium strontium apatitic phase and additional phases. In these two conditions, the calcination at 900 deg C gives pure stoichiometric apatites with the following chemical formula: Ca(10-x)Sr(x)(PO4)6(OH)2 with 0 < = x < = 2. This method can be used in the fabrication of high-temperature ceramics. When the (Ca+Sr)/P atomic ratio is lower than 1.67, the apatites obtained from cements are highly nonstoichiometric, and extra phases remain at low temperature (approximately 40 deg C) and after heat treatment. The use of such materials containing strontium can be proposed in various fields such as preparation of biomaterials for bone filling or compounds intended for the storage of radioactive waste.
Preparation of calcium strontium hydroxyapatites by a new route involving calcium phosphate cements
The results show that it is possible to prepare and to shape apatites containing strontium at low temperatures by the ionic cements route. All the apatites are coherent, homogeneous, and solid. When the (Ca+Sr)/P atomic ratio is equal to 1.67 and the Sr/(Sr+Ca) atomic ratio varies in the range 0 to 0.10, the solid obtained is mainly composed of a mixed Ca-Sr hydroxyapatite. Its chemical formula is Ca(10-x)Sr(x)(PO4)6(OH)2 with 0 < = x < 1. When the (Ca+Sr)/P atomic ratio is equal to 1.67 and the Sr/(Sr+Ca) atomic ratio varies in the range 0.10 to 0.20, the cement is composed of a mixed calcium strontium apatitic phase and additional phases. In these two conditions, the calcination at 900 deg C gives pure stoichiometric apatites with the following chemical formula: Ca(10-x)Sr(x)(PO4)6(OH)2 with 0 < = x < = 2. This method can be used in the fabrication of high-temperature ceramics. When the (Ca+Sr)/P atomic ratio is lower than 1.67, the apatites obtained from cements are highly nonstoichiometric, and extra phases remain at low temperature (approximately 40 deg C) and after heat treatment. The use of such materials containing strontium can be proposed in various fields such as preparation of biomaterials for bone filling or compounds intended for the storage of radioactive waste.
Preparation of calcium strontium hydroxyapatites by a new route involving calcium phosphate cements
Präparation von Calcium-Strontiumhydroxylapatiten über einen neuen Weg unter Einbeziehung von Calciumphosphatzementen
Leroux, L. (author) / Lacout, J.L. (author)
Journal of Materials Research ; 16 ; 171-178
2001
8 Seiten, 11 Bilder, 5 Tabellen, 33 Quellen
Article (Journal)
English
Preparation of calcium strontium hydroxyapatites by a new route involving calcium phosphate cements
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