Mixed alkali effect on chemical durability and mechanical properties of a borosilicate glass series

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

Journal of Non-crystalline Solids Pub Date : 2025-06-07 DOI:10.1016/j.jnoncrysol.2025.123669

Pengcheng You , Yang Shen , Rui Yang , Hong Jiang , Yanfei Zhang , Qiuju Zheng , Yuanzheng Yue

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Abstract

Understanding the mixed alkali effect (MAE) on the chemical durability of glass is crucial for optimizing the composition of nuclear waste immobilization glasses. In this work, we investigated the impact of the substitution of K₂O for Na₂O on structure, chemical durability, and some physical properties of a borosilicate glass series. We found that the fraction of four-coordinated boron (N₄) exhibited a drastic decrease when the molar ratio of potassium ions surpassed a certain threshold. Beyond this threshold, the N₄ fraction remained constant. The structure analyses showed that the additional potassium ions were inclined to break the ring structure, leading to the formation of chain structure. Furthermore, the leaching of the different cations took place through synergistic mechanisms involving {Na&B}, {K&B} and {Al&Ca} pairs. Both the coefficient of thermal expansion (α) and the hardness (H) manifested a pronounced mixed alkali effect. This work provides insights into the correlation between the mixed alkali effect and the physical and chemical properties.

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混合碱对硼硅玻璃系列化学耐久性和力学性能的影响

了解混合碱效应对玻璃化学耐久性的影响，对优化核废料固定玻璃的组成具有重要意义。在这项工作中，我们研究了K2O取代Na2O对硼硅酸盐玻璃系列的结构、化学耐久性和一些物理性能的影响。我们发现，当钾离子的摩尔比超过一定阈值时，四配位硼（N4）的分数急剧下降。超过这个阈值，N4分数保持不变。结构分析表明，附加的钾离子倾向于破坏环结构，形成链状结构。此外，不同阳离子的浸出是通过{Na&；B}、{K&；B}和{Al&；Ca}对的协同机制进行的。热膨胀系数（α）和硬度(H)均表现出明显的混碱效应。这项工作提供了对混合碱效应与物理化学性质之间的相关性的见解。

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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.