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Structural and spectroscopic characterization of a series of potassium- and/or sodium-substituted beta-tricalcium phosphate

  • In this paper, we report X-ray diffraction investigations as well as Raman and solid-state 31P and 23Na magic angle spinning nuclear magnetic resonance (NMR) characterization of three series of calcium orthophosphates. The general formulae of the studied compounds are Ca10.5-x/2Mx(PO4)7, where M = K or Na and x = 0, 0.25, 0.50, 0.75, 1.0; and Ca10KxNa1-x(PO4)7, where x = 0, 0.25, 0.5, 0.75, 1.0. These calcium orthophosphates are found to be isostructural with β-tricalcium phosphate (β-TCP, Ca3(PO4)2) with the substitution of some calcium sites by potassium and/or sodium cations. The unit cell parameters vary continuously with the level of substitution, a characteristic of these solid solutions. The Raman spectra show the different vibrational bands of the phosphate groups PO4, while the NMR chemical shifts are sensitive to the non-equivalent phosphorus and sodium ions present in these substituted samples. As both Raman and NMR spectroscopies are local probes, they offer tools toIn this paper, we report X-ray diffraction investigations as well as Raman and solid-state 31P and 23Na magic angle spinning nuclear magnetic resonance (NMR) characterization of three series of calcium orthophosphates. The general formulae of the studied compounds are Ca10.5-x/2Mx(PO4)7, where M = K or Na and x = 0, 0.25, 0.50, 0.75, 1.0; and Ca10KxNa1-x(PO4)7, where x = 0, 0.25, 0.5, 0.75, 1.0. These calcium orthophosphates are found to be isostructural with β-tricalcium phosphate (β-TCP, Ca3(PO4)2) with the substitution of some calcium sites by potassium and/or sodium cations. The unit cell parameters vary continuously with the level of substitution, a characteristic of these solid solutions. The Raman spectra show the different vibrational bands of the phosphate groups PO4, while the NMR chemical shifts are sensitive to the non-equivalent phosphorus and sodium ions present in these substituted samples. As both Raman and NMR spectroscopies are local probes, they offer tools to distinguish between these different phosphorus and phosphate groups, according to their structural site and local environment, especially the type of cation substituent. A convenient decomposition of the Raman and NMR spectra into Gaussian–Lorentzian components leads us to propose an assignment of the main observed bands of these substituted β-TCPs.zeige mehrzeige weniger

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Metadaten
Autor*innen:S. Quillard, M. Paris, P. Deniard, Renate Gildenhaar, Georg Berger, L. Obadia, J.-M. Bouler
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Acta biomaterialia
Jahr der Erstveröffentlichung:2011
Verlag:Elsevier
Verlagsort:Amsterdam
Jahrgang/Band:7
Ausgabe/Heft:4
Erste Seite:1844
Letzte Seite:1852
Freie Schlagwörter:Bioceramics; Raman spectroscopy; Solid-state NMR spectroscopy; Tricalcium phosphate; X-ray diffraction
DOI:10.1016/j.actbio.2010.12.016
ISSN:1742-7061
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:28.03.2011
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