Publication detail

Lead borophosphate glasses modified by tungsten oxide

Authors: Kalenda Petr | Rösslerová Ivana | Koudelka Ladislav

Year: 2014

Type of publication: ostatní - článek ve sborníku

Name of source: Book of Abstracts of the 24th Joint Seminar Development of Materials Science in Research and Education

Publisher name: Československá společnost pro růst krystalů

Place: Praha

Page from-to: 22

Titles:

Language	Name	Abstract	Keywords
eng	Lead borophosphate glasses modified by tungsten oxide	Borophosphate glasses of the PbO-B2O3-P2O5-WO3 system were studied in two compositional series (1-x)[50PbO-10B2O3-40P2O5]-xWO3 with 0-60 mol% WO3 and (1-x)[50PbO-20B2O3-30P2O5]-xWO3 with 0-40 mol% WO3. Moreover, glasses with the ratio B2O3/P2O5 = 5/45 and 15/35 were studied as well. Thermal behavior of the glasses was studied by differential thermal analysis, thermodilatometry and hot stage microscopy. Glass structure was studied by Raman spectroscopy and also by 31P and 11B MAS NMR spectroscopy. The glass transition temperature increases with increasing WO3 content in both compositional series and almost all prepared glasses crystallize within the range of 500-750 °C. 31P MAS NMR spectra of both compositional series revealed the formation of PO-W bonds with an increasing WO3 content resulting in the shortening of phosphate-chains. 11B MAS NMR spectra reveal the formation of B-O-W bonds in tetrahedral BO4 units resulting in the formation of mixed tetrahedral units BO4 containing B-O-P, B-O-B and B-O-WE bonds. Trigonal BO3 units are formed in the glasses with a higher WO3 content. Raman spectra of the studied glasses also revealed the incorporation of octahedral WO6 units into the glass network and formation of W-O-W bonds in glasses with a high WO3 content.	Borophosphate; glasses, tungsten oxide, glass structure, Raman spectra, NMR spectra

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