Insights into new calcium phosphosilicate xerogels using an advanced characterization methodology

Li, A. and Wang, D. and Xiang, J. and Newport, R. J. and Reinholdt, M. X. and Mutin, P. H. and Vantelon, D. and Bonhomme, C. and Smith, Mark E. and Laurencin, D. and Qiu, D. (2011) Insights into new calcium phosphosilicate xerogels using an advanced characterization methodology. Journal of Non-Crystalline Solids, 357 (19-20). pp. 3548-3555.

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Amorphous calcium phosphosilicate xerogels of high phosphate content were synthesized by a new sol-gel route. Their structural characterization was achieved through the combination of complementary analytical methods, including advanced solid state NMR and scattering techniques. Two representative compositions, with similar P contents but a different Ca:Si ratio, have been chosen for detailed study. Using (43)Ca solid state NMR and Ca K-edge XANES, the Ca local environment in the samples was characterized, revealing that it is similar for both compositions. It was found that P-O-Si linkages are present in both compounds after calcination at 350 degrees C. However, for the sample with the lower Si content, a higher fraction of unusual 6-coordinated silicon was observed. Interestingly, calcium was also found to enhance the network connectivity and to enter the phosphosilicate network without the need for calcination at high temperature, which is advantageous in comparison with syntheses performed previously on similar compounds.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Non-Crystalline Solids
Uncontrolled Keywords:
?? structural characterizationcalcium phosphosilicatesol-gellocal environmentphysicsmaterials chemistryceramics and compositeselectronic, optical and magnetic materialscondensed matter physicsqc physics ??
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Deposited On:
27 Feb 2012 14:13
Last Modified:
15 Jul 2024 12:40