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• W2013447774 abstract "Two commercial hydroxyapatites were treated in dry ammonia at temperatures between 800 and 1300°C for different times up to 30 h. Nitrogen was incorporated with a maximum content of 3·7 wt% in presence of graphite. X-ray diffraction studies show no important phase transformation by the incorporation of nitrogen up to 1200°C. Treatments at temperatures above 1200°C resulted in the formation of CaO or Ca(OH)2. 31P NMR studies indicate no direct bonding of nitrogen and phosphorous. Infrared spectra show increasing intensities of four new bands at 3250, 2016, 1966 and 700 cm−1 with increasing nitrogen contents, while the OH-bands at 3570 and 630 cm−1 vanish. Taking into account results of the carbon content, XRD, NMR and IR spectra it is suggested that nitrogen enters into the structure as [CN2]2− ion, substituting [OH]− groups, and forming cyanamidapatite Ca10(PO4)6(CN2). ©" @default.
• W2013447774 created "2016-06-24" @default.
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• W2013447774 date "1999-11-01" @default.
• W2013447774 modified "2023-09-27" @default.
• W2013447774 title "Nitrogen-containing apatite" @default.
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• W2013447774 doi "https://doi.org/10.1016/s0955-2219(99)00048-5" @default.
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