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Mixed Glass-Former Effect in Silver Borophosphate Glasses Modified with WO3 and MoO3: Structure-Property Correlation

Authors: Hostinský Tomáš | Mošner Petr | Koudelka Ladislav | Montagne Lionel | Rankin Andrew | Tricot Grégory | Vezin Hervé | Buryi Maksym | Marijan Sara | Pavić Luka

Year: 2025

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Mixed Glass-Former Effect in Silver Borophosphate Glasses Modified with WO3 and MoO3: Structure-Property Correlation	This study focuses on the mixed glass-former effect (MGFE) in silver borophosphate glasses doped with tungsten and molybdenum oxides. The investigated systems, 40Ag2O20WO3-(40-x)P2O5-xB2O3 and 40Ag2O-20MoO3-(40-x)P2O5-xB2O3, were studied in the compositional range of x = 0-30 mol% B2O3. Various structural and physical properties were analysed to correlate glass composition with network modifications. Thermal analysis confirmed a non-monotonic trend in the glass transition temperature (Tg), which increases up to 10 mol% B2O3 and then decreases at higher concentrations. Raman spectroscopy revealed that with increasing B2O3 content, the dominant vibrational bands shift, indicating a change in the coordination environment of tungsten and molybdenum. Advanced MAS NMR spectroscopy techniques, including 1D 31P and 11B MAS NMR, 2D 31P INADEQUATE, 11B DQ-SQ, and 11B(31P) D-HMQC, further confirmed structural rearrangements, highlighting a progressive depolymerization of phosphate chains (Q2 to Q0) and an increase in BO3 units at higher B2O3 content. Electrical properties measured by impedance spectroscopy showed a significant increase in DC conductivity by an order of magnitude with increasing B2O3, peaking at 10 mol% before stabilizing. This confirms the presence of MGFE, where borate and phosphate units interact synergistically to enhance silver ion mobility. Phase separation was observed at 30 mol% B2O3, as evidenced by SEM and XRD analyses, leading to a deviation in structural uniformity and electrical behaviour. Our findings provide a detailed structure-property correlation, emphasizing the impact of borate substitution in phosphate glasses. The observed MGFE suggests potential applications in solid-state electrolytes for energy storage technologies.