title: The structure of phosphate glass biomaterials from neutron diffraction and31P nuclear magnetic resonance data.
abstract: Neutron diffraction and31P 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 Q2phosphate 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 [Formula: see text]. In the (CaO)0.5(P2O5)0.5glass most of the Ca2+ions are present in isolated CaOxpolyhedra whereas in the (Na2O)0.5(P2O5)0.5glass the NaOxpolyhedra 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)0.5biomaterial.
authors.affiliation: School of Physical Sciences, University of Kent, Canterbury CT2 7NH, UK.
authors.forename: D M
authors.initials: DM
authors.lastname: Pickup
authors.forename: I
authors.initials: I
authors.lastname: Ahmed
authors.forename: P
authors.initials: P
authors.lastname: Guerry
authors.forename: J C
authors.initials: JC
authors.lastname: Knowles
authors.forename: M E
authors.initials: ME
authors.lastname: Smith
authors.forename: R J
authors.initials: RJ
authors.lastname: Newport