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Abstract
The structure of 50ZnO–10B 2O 3–40P 2O 5+ xTiO 2 glasses prepared by slow cooling (for x=0–24 mol% TiO 2) or by quenching (for x=28–64 mol% TiO 2) was studied by Raman, 31P and 11B MAS NMR spectroscopy. TiO 2 incorporates into the glass structure, which results in a decrease in the molar volume and an increase in the glass transition temperature. According to Raman spectra Ti atoms form distorted TiO 6 octahedra and their incorporation into the structural network results in the depolymerization of phosphate chains. 11B NMR spectra of the glasses with increasing TiO 2 content show gradual changes from one symmetrical signal of B(OP) 4 units to a broad complex signal which was separated into five signals ascribed to four different types of BO 4 units and one BO 3 unit. With increasing TiO 2 content a part of boron atoms changes from tetrahedral BO 4 to trigonal BO 3 units, which is ascribed to the formation of TiO 6 units in the glass structure.
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