The effect of zinc and titanium on the structure of calcium–sodium phosphate based glass
作者： Robert M. Moss , Ensanya A. Abou Neel , David M. Pickup , Helen L. Twyman , Richard A. Martin
DOI: 10.1016/J.JNONCRYSOL.2010.03.006
关键词: Extended X-ray absorption fine structure 、 Absorption spectroscopy 、 Metaphosphate 、 XANES 、 Neutron diffraction 、 Materials science 、 Coordination number 、 Crystallography 、 Phosphate glass 、 Zinc
摘要: An array of different structural probes has been used to define the effect adding Zn and Ti a sodium-calcium phosphate glass. X-ray absorption spectroscopy at K-edge suggests that atoms occupy mixed (4- 6-fold) sites within glass matrix. diffraction reveals feature 2.03 angstrom develops with addition is consistent Zn-O Ti-O near-neighbour distances. Neutron resolve two distinct P-O distances highlights decrease in P center dot coordination number from 2.0 1.7 as metal concentration rises, which attributed O/P fraction moving away metaphosphate value 3.0 3.1 Ti. Other correlations, such those associated CaO(x) NaO(x) polyhedra, remain largely unaffected. These results suggest network forming correlation most disrupted, disorder parameter rising 0.07 0.10 additional modifiers. appears be introduced into direct replacement for Ca causes no variation over composition range studied.
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