University of PardubiceFaculty of Chemical Technology

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Structure and properties of barium tungstate-phosphate glasses

Authors: Kalenda Petr | Koudelka Ladislav | Mošner Petr

Year: 2020

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Structure and properties of barium tungstate-phosphate glasses	Phosphate glasses of the BaO-P2O5-WO3 system were studied in five compositional series: (A) (50-x/2)BaO-xWO3-(50-x/2)P2O5, (B) 50BaO-yWO3-(50-y)P2O5, (C) 40BaO-zWO3-(60-z)P2O5, (D) (60-u)BaO-uWO3-40P2O5 and (E) vBaO-40WO3-(60-v)P2O5. Thermal behavior of the glasses was studied by differential thermal analysis and dilatometry and the glass structure was studied by Raman and 31P MAS NMR spectroscopies. The glass transition temperature, Tg, increases in all compositional series with increasing WO3 content. In glasses with a low WO3 content Raman spectra show on the domination of strong vibrational bands of terminal oxygen atoms in WO6 octahedra at 885 and 945 cm-1 (vibration of W=O and W-O- bonds in tungstate structural units). On the Raman spectra of glasses with a high WO3 content, a broad band at 820-841 cm-1, ascribed to W-O-W bonds, was assigned to the formation of clusters composed of WO6 units. 31P MAS NMR spectra shows on the shortening of phosphate chains in the glass network.	Phosphate glasses; Thermal properties, Raman spectra