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A MAS-NMR and Combined Rietveldt Study of Mixed Calcium/Strontium Fluorapatite Glass-Ceramics

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Abstract:

Strontium is one of the most common substituents in apatite crystals. The presence and behavior of Sr in apatite-group phases are of considerable significance in biology. The present paper investigates the substitution of strontium for calcium in a glass-ceramic of the following composition 4.5SiO23Al2O31.5P2O54CaO1CaF2. The glasses were characterized using Differential Thermal Analysis (DTA), X-ray powder diffraction (XRD), neutron diffraction (ND) and 19F Resonance Magic Angle Spinning Nuclear Magnetic Resonance (MAS-NMR). The all calcium glass crystallized to calcium fluorapatite (Ca5(PO4)3F). Substituting strontium partially for calcium resulted in the formation of a mixed strontium/calcium fluorapatites. In contrast complete substitution resulted in the formation of strontium fluorapatite. MAS-NMR showed the the F to be present as F-Ca(3) representing a fluoride ion surrounded by three Ca2+ ions in the all calcium glass and was present as F-Sr(3) in the all strontium glass. In the mixed glasses fluorine was present as FCa( 3), F-Ca(2)Sr, F-CaSr(2) and F-Sr(3). Ca had a higher tendency to occupy the F-M(3) sites than Sr which may reflect the higher charge to size ratio of Ca2+ relative to Sr2+ and its greater affinity for F- ions.

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Periodical:

Key Engineering Materials (Volumes 309-311)

Pages:

305-308

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.309-311.305

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Online since:

May 2006

Authors:

Robert G. Hill, Adam Calver, Stephen Skinner, Artemis Stamboulis, Robert V. Law

Keywords:

Apatite Glass Ceramics, MAS-NMR, Neutron Diffraction

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References

[1] J.C. Elliot Structure and Chemistry of Apatites, Elsevier Amsterdam (1994).

Google Scholar

[2] A. Clifford, R.G. Hill: J. Non-Crystal. Sol. Vol. 196 (1996), p.346.

Google Scholar

[3] A. Rafferty, A. Clifford, R.G. Hill, D. Wood, B. Samuneva, M. Dimitrova-Lukacs: J. Amer. Ceram. Soc. Vol. 83 (2000), p.2833.

Google Scholar

[4] A. Clifford, R.G. Hill, A. Rafferty, P. Mooney, D. Wood, B. Samuneva, S. Matsuya: J. Mat. Sci.: Mat. Med. Vol. 12 (2001), p.461.

DOI: 10.1023/a:1011213406951

Google Scholar

[5] R.G. Hill, A. Stamboulis, R.V. Law, A. Clifford, M. Towler and C Crowley J. Non. Cryst. Solids. 336/3 (2004); 223-229.

DOI: 10.1016/j.jnoncrysol.2004.02.005

Google Scholar

[6] A.C. Larson & R.B. Von Dreele, General Structure Analysis System, Los Alamos National Laboratory (1995).

Google Scholar

661 and 0. 615.

Google Scholar

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