Structural aspects of lead borate glasses prepared in platinum and alumina crucibles

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

Journal of Non-crystalline Solids Pub Date : 2025-04-16 DOI:10.1016/j.jnoncrysol.2025.123521

Elizabeth M. Tsekrekas , Nagia S. Tagiara , Randall E. Youngman , Efstratios I. Kamitsos , Alexis G. Clare

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Abstract

Lead borate glasses in the system xPbO-(100-x)B₂O₃ have been prepared in platinum and alumina crucibles. Glasses were investigated qualitatively by Raman and infrared spectroscopies, and quantitatively by NMR spectroscopy, to determine the effect of Al₂O₃ contamination on the glass network. Glasses melted in a platinum crucible had a formation range of 30 ≤ x ≤ 80 mol% PbO, while glasses prepared in alumina crucibles experienced an expansion in the formation range, i.e. 20 ≤ x ≤ 85 mol%, as a result of Al₂O₃ contamination from the alumina crucible. Both the mid-frequency Raman and infrared data, as well as NMR spectroscopy, suggest that the introduction of Al₂O₃ within the glass results in the under-modification of the borate network due to the formation of anionic AlO_n type units charge balanced by Pb²⁺ ions. This is also reflected in the low-frequency region of the Raman and infrared spectra, which relates to the Pb-O vibrations, where the Pb-O bonding remains predominately ionic for a larger composition range in the Al₂O₃ contaminated glasses (x ≤ 60), while the Pb-O bond also acquires covalent character for x ≥ 70 mol%.

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在铂和氧化铝坩埚中制备硼酸铅玻璃的结构方面

在铂和氧化铝坩埚中制备了xPbO-(100-x)B2O3体系的硼酸铅玻璃。利用拉曼光谱和红外光谱对玻璃进行了定性研究，并用核磁共振光谱对玻璃进行了定量研究，以确定Al2O3污染对玻璃网络的影响。在铂坩埚中熔化的玻璃的形成范围为30≤x≤80 mol% PbO，而在氧化铝坩埚中制备的玻璃由于氧化铝坩埚中的Al2O3污染，在形成范围内膨胀，即20≤x≤85 mol%。中频拉曼和红外数据以及核磁共振光谱都表明，在玻璃中引入Al2O3导致硼酸盐网络的欠改性，这是由于形成了由Pb2+离子平衡电荷的阴离子AlOn型单元。这也反映在与Pb-O振动有关的拉曼和红外光谱的低频区，在Al2O3污染的玻璃中（x≤60），Pb-O键在较大的组成范围内仍以离子为主，而Pb-O键也获得了x≥70 mol%的共价特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.