Linking the ring-morphology of (Li2O)x(B2O3)100-x and (Na2O)x(B2O3)100-x borate glasses with topological phases and melt dynamics

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids Pub Date : 2025-02-19 DOI:10.1016/j.jnoncrysol.2025.123450

Kandasamy Vignarooban, Charles Skipper, Aaron Welton, Punit Boolchand

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Abstract

Raman scattering and calorimetric measurements on lithium borate, (Li₂O)_x(B₂O₃)_100-x, and sodium borate, (Na₂O)_x(B₂O₃)_100-x, glasses, 0 < x < 45 %, were undertaken to elucidate the role of glass molecular structure on the topological phases and melt dynamics. For (Na₂O)_x(B₂O₃)_100-x glasses, a wide square-well like variation of the enthalpy of relaxation at the glass transition was observed, showing an intermediate phase (IP) in the 20 % < x < 40 % range of soda. Raman results reveal the IP to be correlated with the existence of six unique Isostatically Rigid Local Structures (ISRLSs) which have characteristic ring morphologies appearing sequentially with increasing soda concentration across the IP. Additionally, several narrowly defined Gaussian-like fragility index, m, minima are observed to manifest in the 15 < m < 20 range, which appear sequentially with increasing mol x% and directly correspond to the stoichiometry of the six molecular ring based ISRLS. Parallel results are observed for (Li₂O)_x(B₂O₃)_100-x.

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来源期刊

Journal of Non-crystalline Solids 工程技术-材料科学：硅酸盐

CiteScore

6.50

自引率

11.40%

发文量

576

审稿时长

35 days

期刊介绍： The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.