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    The effect of zinc and titanium on the structure of calcium-sodium phosphate based glass

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    An array of different structural probes has been used to define the effect of adding Zn and Ti to a sodium-calcium phosphate glass. X-ray absorption spectroscopy at the Zn K-edge suggests that the Zn atoms occupy mixed (4- and 6-fold) sites within the glass matrix. X-ray diffraction reveals a feature at 2.03 angstrom that develops with the addition of Zn and Ti and is consistent with Zn-O and Ti-O near-neighbour distances. Neutron diffraction is used to resolve two distinct P-O distances and highlights the decrease in P center dot center dot center dot P coordination number from 2.0 to 1.7 as the Ti metal concentration rises, which is attributed to the O/P fraction moving away from the metaphosphate value of 3.0 to 3.1 with the addition of Ti. Other correlations, such as those associated with CaOx and NaOx polyhedra, remain largely unaffected. These results suggest that the network forming P center dot center dot center dot P correlation is most disrupted, with the disorder parameter rising from 0.07 to 0.10 angstrom with the additional modifiers. Zn appears to be introduced into the network as a direct replacement for Ca and causes no structural variation over the composition range studied. (C) 2010 Elsevier B.V. All rights reserved.

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    Description

    Title : The effect of zinc and titanium on the structure of calcium-sodium phosphate based glass
    Author(s) : RM Moss, EA Abou Neel, DM Pickup, HL Twyman, RA Martin, MD Henson, ER Barney, AC Hannon, JC Knowles, RJ Newport
    Abstract : An array of different structural probes has been used to define the effect of adding Zn and Ti to a sodium-calcium phosphate glass. X-ray absorption spectroscopy at the Zn K-edge suggests that the Zn atoms occupy mixed (4- and 6-fold) sites within the glass matrix. X-ray diffraction reveals a feature at 2.03 angstrom that develops with the addition of Zn and Ti and is consistent with Zn-O and Ti-O near-neighbour distances. Neutron diffraction is used to resolve two distinct P-O distances and highlights the decrease in P center dot center dot center dot P coordination number from 2.0 to 1.7 as the Ti metal concentration rises, which is attributed to the O/P fraction moving away from the metaphosphate value of 3.0 to 3.1 with the addition of Ti. Other correlations, such as those associated with CaOx and NaOx polyhedra, remain largely unaffected. These results suggest that the network forming P center dot center dot center dot P correlation is most disrupted, with the disorder parameter rising from 0.07 to 0.10 angstrom with the additional modifiers. Zn appears to be introduced into the network as a direct replacement for Ca and causes no structural variation over the composition range studied. (C) 2010 Elsevier B.V. All rights reserved.
    Keywords : glass structure g188, neutron diffraction n130, x ray diffraction x130, x ray absorption x120, x ray, biomedical applications, local environment, biocompatibility, spectroscopy, xanes, exafs

    Subject : unspecified
    Area : Other
    Language : English
    Year : 2010

    Affiliations UCL
    Journal : Journal of Non-Crystalline Solids
    Volume : 356
    Issue : 25-27
    Publisher : ELSEVIER SCIENCE BV
    Pages : 1319-1324
    Url : http://discovery.ucl.ac.uk/131620/

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