Univerzita PardubiceFakulta chemicko- technologická

Univerzita Pardubice

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Publikace detail

Pushing limits of Mixed Glass Former Effect in Lithium Borophosphate glasses

Autoři: Hostinský Tomáš | Koudelka Ladislav | Mošner Petr

Rok: 2025

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
eng	Pushing limits of Mixed Glass Former Effect in Lithium Borophosphate glasses	The mixed glass former effect (MGFE) offers a promising strategy for tailoring the structure and functional properties of amorphous solids. In this study, we explore its limits through systematic compositional tuning of lithium borophosphate glasses within the 40Li2OzWO3[(60z)/4(3P2O5-1B2O3)] system. By progressively substituting borate and phosphate units with tungsten oxide while maintaining a fixed P2O5:B2O3 ratio, we investigate how such dual substitution influences structural evolution and ionic conductivity. Comprehensive characterization using density and thermal analysis, Raman spectroscopy, and advanced 1D and 2D MAS NMR techniques reveals a gradual transformation from a phosphateborate to a tungstatedominated glass network. This shift is accompanied by significant structural depolymerisation, including the formation of isolated phosphate and borate units, emergence of WOW linkages, and the growth of mixed tungstate species such as Q0 , Q1 , and BOW environments. Impedance spectroscopy measurements show a remarkable threeorderofmagnitude increase in roomtemperature DC conductivity (from 10−9 to 10−6 Ω −1cm−1) across the compositional series. This enhancement is directly linked to the evolving glass structure, which facilitates lithium ion mobility through the disruption of rigid phosphate and borophosphate networks and the formation of more accessible conduction pathways. Our findings confirm that strategic control over glass former composition enables continuous and predictable optimization of ionic transport. These results not only extend the conceptual framework of the MGFE but also demonstrate a viable path for developing high performance solid electrolytes based on borophosphate glasses.