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Structure and properties of Sb2O3-Containing Zinc Borophosphate Glasses
Autoři: Koudelka Ladislav | Mošner Petr | Montagne Lionel | Palavit Gerard
Rok: 2006
Druh publikace: článek ve sborníku
Název zdroje: 10th International Conference on the Structure of Non-Crystalline Materials, Program and Abstract Book
Název nakladatele: Institute of Physics, Academy of Sciences of the Czech Rep.
Místo vydání: Praha
Strana od-do: 50
Tituly:
Jazyk Název Abstrakt Klíčová slova
cze Struktura a vlastnosti zinečnatých borofosfátových skel s obsahem Sb2O3 Byl studován vliv Sb2O3 na strukturu a vlastnosti zinečnatých borofosfátových skel připravených v kompozičních řadách50ZnO-10B2O3-40P2O5+xSb2O3 (A) a 60ZnO-10B2O3-30P2O5+ySb2O3 (B). Skla byla připravena v kompozičním rozmezí x = 0-70 a y = 0-40 mol% Sb2O3 a následně charakterizována měřením hustoty, molárniho objemu, teploty skelné transformace a koeficientu teplotní roztažnosti. Jejich struktura byla studována pomocí Ramanovy a MAS NMR spektroskopie.
eng Structure and properties of Sb2O3-Containing Zinc Borophosphate Glasses Antimony oxide does not belong to glassformers, but forms glasses with other oxides. In this contribution 2 compositional series of ZnO-B2O3-P2O5 glasses doped with Sb2O3 were investigated: 50ZnO-10B2O3-40P2O5+xSb2O3 (A-series) and 60ZnO-10B2O3-30P2O5+ySb2O3 (B-series). Glasses were obtained in this system within the compositional regions of x = 0-70 and y = 0-40 mol% Sb2O3, respectively. The obtained glasses were characterized by the measurements of density, molar volume, glass transition temperature and thermal expansion coefficient. Their structure was studied by Raman and NMR spectroscopy. Thermal analysis revealed that in both series the value of Tg decreases with increasing Sb2O3 content and this decrease amounts ~70°C in the series A and ~50°C in the series B. On the other side, thermal expansion coefficient increases from 7.0 to 10.3x10-6. All studied glasses crystallize on heating within the temperature region of 470-620°C. Raman spectra of the A-series reveal relatively large changes in the high-frequency region within the additions of Sb2O3 in the range of x = 0-25mol%. The shift of the dominant band of vibrations of PO4 units from 1166 to 1036 cm-1 is explained by the depolymerization of remaining phosphate chains. This interpretation is supported by changes in the middle-frequency range of Raman spectra where the band of 746-754 cm-1 (ascribed to the vibrations of bridging oxygen atoms between Q1 units) decreases its strength with increasing Sb2O3. Antimony oxide forms in this region isolated SbO3 pyramids manifested in Raman spectra by a broad vibrational band at ~550-640 cm-1. In the glasses with a higher Sb2O3 content changes in the phosphate network are small and SbO3 units form clusters with Sb-O-Sb bridges manifested in the Raman spectra by a strong band in the region of 410-460 cm-1. The observed changes in the 31P MAS NMR spectra with increasing Sb2O3 content reflect also the depolymerization of phosphate chains at low Sb2O3 concentration borophosphate glasses, structure, properties, zinc, antimony

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