D M Pickup et al 2007 J. Phys.: Condens. Matter 19 415116 doi:10.1088/0953-8984/19/41/415116
The structure of phosphate glass biomaterials from neutron diffraction and 31P nuclear magnetic resonance data
D M Pickup1, I Ahmed2, P Guerry3, J C Knowles2, M E Smith3 and R J Newport1
Show affiliationsNeutron diffraction and 31P nuclear magnetic resonance spectroscopy were used to probe the structure of phosphate glass biomaterials of general composition (CaO)0.5−x(Na2O)x(P2O5)0.5 (x = 0, 0.1 and 0.5). The results suggest that all three glasses have structures based on chains of Q2 phosphate groups. Clear structural differences are observed between the glasses containing Na2O and CaO. The P–O bonds to bridging and non-bridging oxygens are less well resolved in the neutron data from the samples containing CaO, suggesting a change in the nature of the bonding as the field strength of the cation increases 
. In the (CaO)0.5(P2O5)0.5 glass most of the Ca2+ ions are present in isolated CaOx polyhedra whereas in the (Na2O)0.5(P2O5)0.5 glass the NaOx polyhedra share edges leading to a Na–Na correlation. The results of the structural study are related to the properties of the (CaO)0.4(Na2O)0.1(P2O5)0.5 biomaterial.
- PACS
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61.05.Qr Magnetic resonance techniques; Mössbauer spectroscopy
- Subjects
- Dates
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Issue 41 (17 October 2007)
Received 6 March 2007, in final form 11 April 2007
Published 27 September 2007
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The structure of phosphate glass biomaterials from neutron diffraction and 31P nuclear magnetic resonance data
D M Pickup et al 2007 J. Phys.: Condens. Matter 19 415116
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