Univerzita Pardubice Fakulta chemicko- technologická

Univerzita Pardubice

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Publikace detail

Structure and properties of Ag2O−GeO2−P2O5 glasses

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

Rok: 2024

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
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.