Magnesium and calcium mixed effect on thermal conductivity in a borosilicate glass

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

Journal of Non-crystalline Solids Pub Date : 2025-04-01 DOI:10.1016/j.jnoncrysol.2025.123522

Shenglin Chen , Qing Zhang , Yingting Cai , Chao Huang , Ang Qiao , Haizheng Tao

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Abstract

To investigate the mixed effect of magnesium and calcium on thermal conductivity, a series of borosilicate glasses with varying molar ratios R (R = [MgO]/([MgO]+[CaO])), specifically 65.0SiO₂·5.0B₂O₃·17.4Na₂O·0.5K₂O·(12.1-x)CaO·xMgO, were synthesized. As MgO content increased, thermal conductivity exhibited a near-linear rise for R values from 0.0 to 0.6, followed by a negative deviation up to R = 1.0. Utilizing the phonon gas model, key factors influencing thermal conductivity—volumetric heat capacity (C), phonon mean free path (l), and Debye sound velocity—were analyzed. Given the minimal variations in C and l, Debye sound velocity emerged as the predominant factor governing thermal conductivity in these glasses. Furthermore, by examining the dual roles of Mg cations as either network modifiers or formers, alongside the evolution of Si-O tetrahedra-related clusters through Raman and NMR spectra, we elucidated the atomic-scale structural origins driving the linear and nonlinear dependencies of thermal conductivity on R.

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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.