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Structure and properties of glasses in ZnO-P2O5-TeO2 system
Authors: Mošner Petr | Vosejpková Kateřina | Koudelka Ladislav | Montagne Lionel | Revel Bertrand
Year: 2011
Type of publication: článek v odborném periodiku
Name of source: Journal of Non-Crystalline Solids
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 2648-2652
Titles:
Language Name Abstract Keywords
cze Struktura a vlastnosti skel systému ZnO-P2O5-TeO2 Byla studována skla systému ZnO-P2O5-TeO2 v kompozičních řadách (100-x)[0.5ZnO-0.5P2O5]-xTeO2 (série X, x=0-60) a 50ZnO-50-y)P2O5-yTeO2 (série Y, y=0-40). Struktura byla studována pomocí Ramanovy spekroskopie a 31P MAS NMR spektroskopie. Z spektroskopických metod vyplynulo, že zvyšování obsahu TeO2 ve sklech vede k postupné depolymerizaci fosforečnanové strukturní sítě až na izolované tetraedry PO4.Záměna vazeb P-O za vazby Te-O vede k poklesu teploty skelné transformace v obou kompozičních řadách. fosforečnanová skla; telluričitá skla; struktura; vlastnosti
eng Structure and properties of glasses in ZnO-P2O5-TeO2 system Glasses in the ZnO-P2O5-TeO2 system were prepared and studied in compositional series (100-x)[0.5ZnO-0.5P2O5]-xTeO2 (X-series, x=0-60) and 50ZnO-(50-y)P2O5-yTeO2 (Y-series, y=0-40). Their structure was studied by Raman and 31P MAS NMR spectroscopies. The incorporation of TeOx units into the structural network is associated with the depolymerisation of phosphate chain structure as revealed by both methods. At a high TeO2 content isolated PO4 tetrahedra are formed in the structure of glass series Y, while diphosphate O3P-O-PO3 groups are present in the structure of the glass series X. In the structure of glass series Y tellurium atoms form predominantly TeO3 trigonal pyramids, whereas in the X glass series TeO4 trigonal bipyramids prevail in the glass structure. The addition of TeO2 to the parent zinc metaphosphate glass results in a decrease of glass transition temperature in both compositional series associated with the replacement of stronger P-O bonds by weaker Te-O bonds. Phosphate glasses; Tellurite glasses; Structure; Properties

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