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Structure and properties of Ag2O−GeO2−P2O5 glasses

Authors: Hostinský Tomáš | Mošner Petr | Koudelka Ladislav | Montagne Lionel | Rankin Andrew | Pavić Luka | Razum Marta

Year: 2024

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Structure and properties of Ag2O−GeO2−P2O5 glasses	Phosphate glasses of the Ag2O−GeO2−P2O5 system were studied in compositional series (50-x)Ag2O−xGeO2−50P2O5 with 0-40 mol% GeO2. Basic physical properties were determined, and thermal properties studied by differential thermal analysis, thermomechanical analysis, and hot-stage microscopy. The glass structure was investigated using Raman spectroscopy and 31P MAS NMR by both 1D and 2D techniques. The electrical properties of the glasses were obtained by using impedance spectroscopy. Ag2O substitution by GeO2 results in a significant increase of both glass transition temperature, Tg, and crystallization temperature, Tc, up to 628 °C (Tg) and 851 °C (Tc) at x = 40 mol% GeO2. The glass structure was investigated from the analysis of 31P MAS NMR and Raman spectra. Both methods show transformation of phosphate glass network formed mainly by Q2 units to germanate-phosphate network formed by Q1xGe and Q21Ge phosphate units and germanate units. Raman spectra, in addition, reveal evolution of P‒O‒P linkages to P‒O‒Ge and Ge‒O‒Ge linkages through the glass series. DC conductivity trend upon GeO2 addition showed non-monotonic behaviour, which is related to structural changes in the glass-network.