Structural Investigations Of Si02-Containing Phosphate Glasses

The incorporation of Si02 into phosphate glasses is interesting in view of the development of phosphatic biomaterials. This investigation is concerned with the incorporation of Si02 into phosphate base glasses with long phosphate chains or rings formed by Q2 phosphate structural groups, glasses with shorter phosphate chains formed by Q2 and Q1 groups and glasses with phosphate invert glass structure, posessing ortho(Qo)- and phyrophosphate groups (two Q1 groups) exclusively. The structures of these glasses in dependence on the incorporated silica were investigated by transmission electron microscopy and by 31P MAS NMR. The principles of incorporation are discussed.