Journal of Non-crystalline Solids最新文献_第6页

Structural and compositional evolution of silicon–aluminum smelting fly ash during acid leaching and characteristics of the resulting amorphous silica 酸浸过程中硅铝冶炼飞灰的结构、成分演变及非晶态二氧化硅的特性

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2026-02-01 Epub Date: 2025-12-30 DOI: 10.1016/j.jnoncrysol.2025.123935

Jilun Wei , Tong Zheng , Hanjing Luo , Xinglei Gao , You Xu , Shaonan Xu , Weidong Ai , Nan Li

Over 15 million tons of high-alumina coal gangue are generated annually in Ordos, Inner Mongolia. The “carbothermic reduction–iron separation” process developed by Jilin University can convert about 6 million tons of this waste each year, but simultaneously produces large amounts of amorphous silicon–aluminum smelting fly ash, a by-product that has remained almost entirely unstudied and unused.

This work presents the first systematic investigation of this fly ash and proposes an efficient acid-leaching route aimed not only at impurity removal but also at the functional reuse of the leaching residue as a value-added material. Specifically, the acid-leaching process simultaneously enables selective dissolution of undesired components and in situ transformation of the residue into high–surface-area mesoporous silica (SF-A), thereby establishing a clear valorization pathway rather than a simple extraction process. Optimized HCl leaching selectively removes Al, Na, and S species and induces the in-situ formation of a Si-rich amorphous framework. The resulting SF-A exhibits a BET surface area of 607.2 m² g⁻¹, a pore volume of 0.507 cm³ g⁻¹, and excellent thermal stability up to 600 °C. It also shows a methylene-blue adsorption capacity of 75.9 mg g⁻¹, with kinetic analysis indicating that the adsorption process is predominantly governed by diffusion-controlled physical adsorption on the porous silica framework, showing competitive adsorption performance compared with common waste-derived adsorbents.

This method provides a sustainable pathway for the high-value utilization of silicon–aluminum smelting fly ash and yields thermally stable mesoporous silica suitable for adsorption-oriented utilization.

内蒙古鄂尔多斯高铝煤矸石年产量超过1500万吨。吉林大学开发的“碳热还原-铁分离”工艺每年可转化约600万吨这种废物，但同时产生大量非晶硅铝冶炼飞灰，这是一种几乎完全未被研究和利用的副产品。本研究首次对粉煤灰进行了系统的研究，并提出了一种高效的酸浸路线，不仅旨在去除杂质，而且还旨在将浸出渣作为增值材料进行功能性再利用。具体而言，酸浸过程同时实现了不需要组分的选择性溶解和残留物的原位转化为高表面积介孔二氧化硅（SF-A），从而建立了明确的增值途径，而不是简单的提取过程。优化的HCl浸出选择性地去除Al， Na和S，并诱导原位形成富si的非晶骨架。所得的SF-A的BET表面积为607.2 m2 g−1，孔体积为0.507 cm3 g−1，热稳定性高达600°C。亚甲基蓝吸附量为75.9 mg g−1，动力学分析表明，吸附过程主要由扩散控制的物理吸附在多孔二氧化硅框架上，与普通废物源吸附剂相比，具有竞争性的吸附性能。该方法为硅铝冶炼粉煤灰的高价值利用提供了一条可持续的途径，并获得了适合于吸附定向利用的热稳定介孔二氧化硅。

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引用次数: 0

Towards stable metal organic-inorganic complex glasses 迈向稳定的金属有机-无机复合玻璃

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2026-02-01 Epub Date: 2025-12-22 DOI: 10.1016/j.jnoncrysol.2025.123923

Tianzhao Xu , Zhencai Li , Kai Zheng , Hanmeng Zhang , Kenji Shinozaki , Huotian Zhang , Lars R. Jensen , Feng Gao , Jinjun Ren , Yanfei Zhang , Yuanzheng Yue

Metal organic-inorganic complex (MOIC) glasses have emerged as a new family of hybrid glasses. However, the low thermal stability of MOIC glasses fabricated via crystallization suppression constrains their practical applicability under ambient conditions. Here, we report a novel approach for preparing the MOIC glasses that combines slow-solvent removal with subsequent quenching to avoid gel thermal decomposition and enhance the thermal stability of the obtained glass. Specifically, the new approach utilizes an aprotic solvent (acetone) to kinetically prevent the ordering of the metal-ligand complex molecules in solution, thereby suppressing crystallization and forming a gel. The subsequent gradual drying process leads to the removal of the solvent to enhance the connections between molecules through hydrogen bonds, thus causing the formation of a hydrogen-bonded network. The increased network connectivity lowers the mobility of the molecules, thereby enhancing the thermal stability of the system. A disordered network of dried gel is frozen-in via cooling from 130 °C to room temperature, and hence, MOIC glass forms. Structural analyses reveal that hydrogen bonds are responsible for connecting the tetrahedral units. The as-prepared MOIC glass exhibits an increase in glass transition temperature (T_g) during rapid room-temperature relaxation, enhanced CO₂ uptake, and a red shift in photoluminescence. This work not only presents a novel strategy for fabricating large-sized, stable, functional MOIC glasses but also uncovers the critical role of hydrogen bonds in MOIC glass formation.

金属有机无机配合物（MOIC）玻璃是一种新型的杂化玻璃。然而，抑制结晶法制得MOIC玻璃的热稳定性较低，限制了其在环境条件下的实际应用。在这里，我们报告了一种制备MOIC玻璃的新方法，该方法结合了缓慢溶剂去除和随后的淬火，以避免凝胶热分解并提高所获得玻璃的热稳定性。具体来说，新方法利用非质子溶剂（丙酮）在动力学上阻止溶液中金属配体复合物分子的有序，从而抑制结晶和形成凝胶。随后的逐渐干燥过程导致溶剂的去除，通过氢键加强分子之间的连接，从而形成氢键网络。增加的网络连通性降低了分子的迁移率，从而增强了系统的热稳定性。通过从130°C冷却到室温，干燥凝胶的无序网络被冻结，从而形成MOIC玻璃。结构分析表明，氢键负责连接四面体单元。制备的MOIC玻璃在室温快速弛豫过程中玻璃化转变温度（Tg）升高，CO2吸收增强，光致发光红移。这项工作不仅提出了一种制造大尺寸、稳定、功能MOIC玻璃的新策略，而且揭示了氢键在MOIC玻璃形成中的关键作用。

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引用次数: 0

Electron-beam-induced reversible crystalline–amorphous phase switching in silicon: A unified beam-heating perspective 电子束诱导可逆硅晶-非晶相开关：统一的束加热视角

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2026-02-01 Epub Date: 2025-12-17 DOI: 10.1016/j.jnoncrysol.2025.123920

Sung Bo Lee , Jaehun Kim , Jeongin Paeng , Sung-Gyu Kang , Jihye Kwon , Chi Won Ahn , Hyoung Seop Kim

Prior studies have independently reported electron-beam-induced crystallization of amorphous silicon (a-Si) and amorphization of crystalline silicon (c-Si), yet a unified explanation for these opposing transitions remains elusive. Conventional models invoke knock-on atomic displacement or bond breaking via electronic excitation, though it is counterintuitive that both could arise from the same athermal mechanisms. Using in situ transmission electron microscopy, we present the first direct observation of reversible phase switching—from a-Si to c-Si and back—under constant irradiation. These findings challenge prevailing assumptions, suggesting distinct driving forces. To assess the possible contribution of beam heating to the driving forces, we employed a combination of Monte Carlo simulations and finite element analysis, incorporating Auger excitation as a plausible heating mechanism. The results reveal that heat accumulation becomes increasingly pronounced as thermal conductivity decreases from c-Si to a-Si. This trend suggests that crystallization in a-Si is driven by beam-induced heating, whereas amorphization in c-Si is primarily governed by knock-on atomic displacements. This study establishes a coherent framework for understanding electron–matter interactions and enables phase control in amorphous materials at the nanoscale.

先前的研究已经独立地报道了电子束诱导的非晶硅（a- si）的结晶和晶体硅（c-Si）的非晶化，但是对于这些相反的转变仍然没有一个统一的解释。传统的模型通过电子激发引发原子碰撞位移或键断裂，尽管这两者都可能来自相同的非热机制，这是违反直觉的。利用原位透射电子显微镜，我们首次直接观察到在恒定辐照下，从a-Si到c-Si再到c-Si的可逆相变。这些发现挑战了普遍的假设，表明了不同的驱动力。为了评估光束加热对驱动力的可能贡献，我们采用了蒙特卡罗模拟和有限元分析相结合的方法，并将俄采激励作为一种合理的加热机制。结果表明，当导热系数从c-Si降低到a-Si时，热积累变得越来越明显。这一趋势表明，a-Si的结晶是由束致加热驱动的，而c-Si的非晶化主要是由原子碰撞位移控制的。本研究为理解电子-物质相互作用建立了一个连贯的框架，并使非晶材料在纳米尺度上的相控制成为可能。

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引用次数: 0

Incorporation mechanisms of niobium into lithium borate glasses: Insights from solid state nuclear magnetic resonance and Raman spectroscopy 铌在硼酸锂玻璃中的掺入机制：来自固态核磁共振和拉曼光谱的见解

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2026-02-01 Epub Date: 2025-12-30 DOI: 10.1016/j.jnoncrysol.2025.123912

Rafaella Bartz Pena , Henrik Bradtmüller , Laureano Ensuncho , Marcos De Oliveira Jr. , Hellmut Eckert

The scientific and technological interest in niobium-bearing materials has significantly increased in recent years. Still, reports on the structural details about the short- and medium-range order of the intermediate oxide Nb₂O₅ in glasses are quite scarce. In this work, the structural mechanisms underlying the incorporation of niobium oxide into lithium metaborate glass spanning concentrations up to ∼25 mol % are investigated through standard and advanced solid-state nuclear magnetic resonance and Raman spectroscopies. The commonly encountered NbO₆ distorted octahedral coordination occurs across the entire range of concentrations. With increasing niobia content, systematic changes in the speciation of the three-coordinated boron units are observed, revealing a progressive increase in the concentration of

B O_{3 / 2}

trigonal sites at the expense of anionic

B O_{2 / 2} O^{-}

groups. Furthermore, heteronuclear dipolar ⁷Li–⁹³Nb, and unprecedented ¹¹B^(III)–⁹³Nb and ¹¹B^(IV)–⁹³Nb recoupling experiments reveal an increase in all of the dipolar interaction strengths, reflecting the formation of B-O-Nb connectivities with increasing Nb₂O₅ content.. Above 10 mol % Nb₂O₅, the Raman spectra suggest the onset of niobium-oxide clustering. Altogether, these results suggest that niobium acts as a network former in alkali borate glasses, which is in consonance with the structural role reported for Nb₂O₅ in alkali silicate and phosphate glasses.

近年来，人们对含铌材料的科技兴趣显著增加。然而，关于玻璃中中间体氧化物Nb2O5的中短程序结构细节的报道却很少。在这项工作中，通过标准和先进的固态核磁共振和拉曼光谱研究了氧化铌掺入浓度高达25 mol %的偏酸锂玻璃中的结构机制。常见的NbO6畸变八面体配位发生在整个浓度范围内。随着铌含量的增加，观察到三配位硼单元形态的系统性变化，揭示了BO3/2三角位的浓度逐渐增加，而阴离子bo2 / 20 -基团的浓度则逐渐增加。此外，异核偶极7Li-93Nb，以及前所未有的11B(III) -93Nb和11B(IV) -93Nb偶极耦合实验表明，随着Nb2O5含量的增加，所有的偶极相互作用强度都增加了，这反映了B-O-Nb连接的形成。当Nb2O5浓度超过10 mol %时，拉曼光谱表明氧化铌团簇的开始。综上所述，这些结果表明铌在碱硼酸盐玻璃中作为网络形成物，这与Nb2O5在碱硅酸盐和磷酸盐玻璃中的结构作用一致。

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引用次数: 0

Effects of CuO and β-eucyptite on the structure, properties and fracture mechanism of a low-melting glass for vacuum glazing CuO和β-绿柱石对真空上釉低熔玻璃结构、性能和断裂机理的影响

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2026-02-01 Epub Date: 2025-12-03 DOI: 10.1016/j.jnoncrysol.2025.123890

Weiwei Wang , Hui Yan , Xin Cao , Jiwen Jiang , Junfei Liu , Shou Peng

In this study, a series of novel lead-free Bi₂O₃–B₂O₃–ZnO–BaO–CuO low-melting glasses with varying content of CuO were prepared, and these matrix glass powder were then used to form composite glass with varying additions of β-eucryptite. The effects of the content of CuO and β-eucryptite on the structure, thermal properties, sealing performance and microstructure of the low-melting glasses were investigated. Structural analysis indicates that the glasses were composed of [BiO₃], [BiO₆], [BO₃] and [BO₄] basic units, and the amounts of [BiO₃] and [BiO₆] units decreased with increasing content of CuO, while the transformation of [BO₄] to [BO₃] led to a gradual increase in the amount of [BO₃], which loosened the glass structure. The coefficient of thermal expansion (CTE) of the glasses gradually increased, while the characteristic temperature (T_g and T_d) and sealing temperature showed the opposite trend. The results also indicated that the CTE of the composite glasses decreased significantly with an increase in the external addition of β-eucryptite, and the sealing temperature did not increase substantially. Optimal comprehensive performance was observed at a β-eucryptite content of 6 %, resulting in a lower CTE of 87 × 10^–7 / °C and sealing temperature of 415 °C. Following sealing, the factors affecting the sealing strength and fracture mechanism of the sealing glasses were examined. The composite glasses are well-suitable as sealing materials for vacuum glazing, meeting the requirements for low-melting sealing glass and exhibiting a favorable market prospect.

本研究制备了一系列不同CuO含量的新型无铅Bi2O3-B2O3-ZnO-BaO-CuO低熔玻璃，并将这些基质玻璃粉用于添加不同β-赤铁矿的复合玻璃。研究了CuO和β-红榴石含量对低熔玻璃的结构、热性能、密封性能和显微组织的影响。结构分析表明，玻璃由[BiO3]、[BiO6]、[BO3]和[BO4]四个基本单元组成，[BiO3]和[BiO6]单元的含量随着CuO含量的增加而减少，而[BO4]向[BO3]的转化导致[BO3]含量逐渐增加，使玻璃结构松动。玻璃的热膨胀系数（CTE）逐渐增大，特征温度（Tg和Td）和密封温度呈相反趋势。结果还表明，复合玻璃的CTE随外添加量的增加而显著降低，而密封温度没有明显升高。当β-赤铁矿含量为6%时，复合材料的综合性能最佳，CTE为87 × 10-7 /°C，密封温度为415°C。密封后，对影响密封玻璃密封强度的因素和断裂机理进行了研究。该复合玻璃非常适合作为真空上釉的密封材料，满足低熔点密封玻璃的要求，具有良好的市场前景。

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引用次数: 0

KH550, KH560, and KH570 modified SiO2 enhance the moisture resistance, thermal properties and electrical insulation properties of epoxy resin: Based on experiments and molecular dynamics simulations KH550、KH560、KH570改性SiO2提高环氧树脂的耐湿性、热性能和电绝缘性能：基于实验和分子动力学模拟

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2026-02-01 Epub Date: 2025-12-19 DOI: 10.1016/j.jnoncrysol.2025.123922

Han Zeng, Maoqiang Bi, Zhonghe Tong, Yingtai Du, Xi Chen, Tianyan Jiang

In this study, the enhancement mechanism of SiO₂ modified by different silane coupling agents (SCA) on the moisture resistance, thermal properties and electrical insulation properties of epoxy resin (EP) composites is discussed. Through the combination of experimental tests and molecular dynamics (MD) simulations, the performance differences of five systems (EP, SiO₂-EP, KH550 / SiO₂-EP, KH560 / SiO₂-EP, KH570 / SiO₂-EP) in water absorption, glass transition temperature (T_g) and volume resistivity are analyzed. The changes of free volume fraction (FFV), interaction energy, number of hydrogen bonds and diffusion behavior of water molecules are revealed from the microscopic point of view. The experimental results show that the introduction of modified SiO₂ significantly improves the moisture resistance, thermal properties and electrical properties of EP. Among them, KH550 modified SiO₂ has the best effect, T_g increases by 12.3 %, volume resistivity increases by 22.1 %, and water absorption rate decreases by 21.9 % at 60 °C. MD simulations further confirm that the nano-SiO₂ modified by SCA can effectively limit the diffusion of water molecules and reduce the effect of temperature on the mean square displacement (MSD) of the system. The KH550 / SiO₂-EP system has the smallest free volume and the highest number of hydrogen bonds, which effectively inhibits the diffusion of water molecules and the movement of molecular chains. This study provides a theoretical basis and material design strategy for the application of epoxy composites in hygrothermal environments.

本研究探讨了不同硅烷偶联剂（SCA）改性SiO2对环氧树脂（EP）复合材料的耐湿性、热性能和电绝缘性能的增强机理。通过实验测试与分子动力学（MD）模拟相结合，分析了EP、SiO2-EP、KH550 / SiO2-EP、KH560 / SiO2-EP、KH570 / SiO2-EP五种体系在吸水性、玻璃化转变温度（Tg）和体积电阻率等方面的性能差异。从微观角度揭示了水分子的自由体积分数（FFV）、相互作用能、氢键数和扩散行为的变化。实验结果表明，改性SiO2的引入显著提高了EP的耐湿性、热学性能和电学性能。其中，以KH550改性SiO2效果最好，在60℃时Tg提高12.3%，体积电阻率提高22.1%，吸水率降低21.9%。MD模拟进一步证实了SCA修饰的纳米sio2能够有效地限制水分子的扩散，降低温度对体系均方位移（MSD）的影响。KH550 / SiO2-EP体系的自由体积最小，氢键数最多，能有效抑制水分子的扩散和分子链的移动。本研究为环氧复合材料在湿热环境中的应用提供了理论依据和材料设计策略。

{"title":"KH550, KH560, and KH570 modified SiO2 enhance the moisture resistance, thermal properties and electrical insulation properties of epoxy resin: Based on experiments and molecular dynamics simulations","authors":"Han Zeng, Maoqiang Bi, Zhonghe Tong, Yingtai Du, Xi Chen, Tianyan Jiang","doi":"10.1016/j.jnoncrysol.2025.123922","DOIUrl":"10.1016/j.jnoncrysol.2025.123922","url":null,"abstract":"<div><div>In this study, the enhancement mechanism of SiO<sub>2</sub> modified by different silane coupling agents (SCA) on the moisture resistance, thermal properties and electrical insulation properties of epoxy resin (EP) composites is discussed. Through the combination of experimental tests and molecular dynamics (MD) simulations, the performance differences of five systems (EP, SiO<sub>2</sub>-EP, KH550 / SiO<sub>2</sub>-EP, KH560 / SiO<sub>2</sub>-EP, KH570 / SiO<sub>2</sub>-EP) in water absorption, glass transition temperature (<em>T</em><sub>g</sub>) and volume resistivity are analyzed. The changes of free volume fraction (FFV), interaction energy, number of hydrogen bonds and diffusion behavior of water molecules are revealed from the microscopic point of view. The experimental results show that the introduction of modified SiO<sub>2</sub> significantly improves the moisture resistance, thermal properties and electrical properties of EP. Among them, KH550 modified SiO<sub>2</sub> has the best effect, <em>T</em><sub>g</sub> increases by 12.3 %, volume resistivity increases by 22.1 %, and water absorption rate decreases by 21.9 % at 60 °C. MD simulations further confirm that the nano-SiO<sub>2</sub> modified by SCA can effectively limit the diffusion of water molecules and reduce the effect of temperature on the mean square displacement (MSD) of the system. The KH550 / SiO<sub>2</sub>-EP system has the smallest free volume and the highest number of hydrogen bonds, which effectively inhibits the diffusion of water molecules and the movement of molecular chains. This study provides a theoretical basis and material design strategy for the application of epoxy composites in hygrothermal environments.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"674 ","pages":"Article 123922"},"PeriodicalIF":3.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145798063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Eu2+-doped fluorochlorosilicate transparent spectral conversion glass 掺Eu2+氟氯硅酸盐透明光谱转换玻璃

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2026-02-01 Epub Date: 2025-12-11 DOI: 10.1016/j.jnoncrysol.2025.123913

Changjian Wang , Yujie Liu , Xingze Chen , Xianping Fan , Xvsheng Qiao , Qun Luo , Hai Guo

Spectral conversion technology provides an effective way to solve the spectral mismatch of solar cells by harvesting extra photons out of the response region. In this work, an Eu²⁺-doped fluorochlorosilicate glass was developed as a spectral conversion material. A dual compositional tuning strategy, involving the adjustment of the Cl⁻/F⁻ and Al₂O₃/La₂O₃ ratios, was employed to optimize the transmittance, luminescence, and mechanical properties. The optimized glass exhibits a high external quantum yield exceeding 50%, visible light transmittance over 90%, and improved mechanical robustness. When applied as a spectral conversion layer in organic solar cells (OSCs), the glass enhanced the power conversion efficiency (PCE) from a reference value of 12.88% to 13.63%, for a relative enhancement of approximately 5.5%. These results suggest that this glass is a promising spectral conversion material for improving the performance of OSCs.

光谱转换技术通过在响应区收集额外的光子，为解决太阳能电池的光谱失配问题提供了有效的途径。本文研究了一种掺Eu2+的氟氯硅酸盐玻璃作为光谱转换材料。通过调整Cl−/F−和Al2O3/La2O3的比例，采用双组分调整策略优化了透光率、发光性能和力学性能。优化后的玻璃具有超过50%的高外量子产率，超过90%的可见光透过率，以及更好的机械稳健性。当作为光谱转换层应用于有机太阳能电池（OSCs）时，该玻璃将功率转换效率（PCE）从参考值12.88%提高到13.63%，相对提高了约5.5%。这些结果表明，这种玻璃是一种很有前途的光谱转换材料，可以改善OSCs的性能。

引用次数: 0

Effect of B2O3 on the structure and properties of low-dielectric boron aluminosilicate glass used for glass fibers B2O3对玻璃纤维用低介电硼铝硅酸盐玻璃结构和性能的影响

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2026-02-01 Epub Date: 2025-12-10 DOI: 10.1016/j.jnoncrysol.2025.123916

Yue Mi , Cong Ao , Qingyang Shen , Zhehui Sun , Qinghuang Zhang , Binchang Zhang , Lixiong Han , Jun Xie , Dehua Xiong

This study investigated the effects of the Mg/B mass ratio on the structure, high-temperature rheological behavior, and dielectric properties of MgO-Al₂O₃-B₂O₃-SiO₂ based boron aluminosilicate glass. The results indicated that after the substitution of B₂O₃ for MgO, the contents of both [BO₃] and [BO₄] units increased; however, the dominant coordination gradually shifted from [BO₄] to [BO₃]. Notably, variations in the Mg/B ratio significantly altered the coordination environment of Al³⁺, leading to an increase in the content of [AlO₅] units from 28.80 % to 45.11 %. These structural changes resulted in an increased degree of polymerization but a weakened network rigidity. Consequently, the coefficient of thermal expansion (CTE), glass transition temperature (T_g), flexural strength, dielectric constant, and dielectric loss were all reduced. At an optimized Mg/B mass ratio of 0.12, the glass sample exhibited a favorable combination of dielectric properties (dielectric constant = 4.48 @10 GHz, dielectric loss = 2.0 × 10^–3 @10 GHz) and a low fiber drawing temperature (1301 °C), which is suitable for the production of glass fibers.

研究了Mg/B质量比对MgO-Al2O3-B2O3-SiO2基硼铝硅酸盐玻璃结构、高温流变性能和介电性能的影响。结果表明：B2O3取代MgO后，[BO3]和[BO4]单元的含量均增加；但优势配位逐渐由[BO4]向[BO3]转变。值得注意的是，Mg/B比的变化显著改变了Al3+的配位环境，导致[AlO5]单位的含量从28.80%增加到45.11%。这些结构变化导致聚合程度增加，但削弱了网络刚性。因此，热膨胀系数（CTE）、玻璃化转变温度（Tg）、抗弯强度、介电常数和介电损耗均有所降低。在Mg/B质量比为0.12的优化条件下，玻璃样品具有良好的介电性能（介电常数= 4.48 @10 GHz，介电损耗= 2.0 × 10-3 @10 GHz）和较低的拉伸温度（1301℃），适合生产玻璃纤维。

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引用次数: 0

Effect of oxygen on the glass forming ability, mechanical properties and corrosion resistance of Mo-based bulk metallic glass 氧对钼基大块金属玻璃的玻璃成形能力、力学性能和耐腐蚀性能的影响

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2026-02-01 Epub Date: 2025-12-07 DOI: 10.1016/j.jnoncrysol.2025.123904

Tao Li , Chen Su , Pengcheng Zhang , Siming Xiao , Yifan Ruan , Shengfeng Guo

MoCoB bulk metallic glass (BMG) exhibits very high thermal stability and outstanding mechanical properties. However, their wide applications are still limited due to the poor glass forming ability (GFA) and critical preparing conditions, particularly the need for low oxygen content. This study systematically investigated the effects of oxygen on the properties of MoCoB BMG. A small amount of oxygen incorporation (≤1064 ppm) significantly enhanced the GFA, increasing the critical diameter from 1.2 mm to 2 mm, due to a reduced thermodynamic driving force for crystallization. Moreover, the addition of 676 ppm oxygen simultaneously improves the mechanical properties of MoCoB BMG with the microhardness of 1347 HV, compressive strength of above 5000 MPa, nanohardness of 19 GPa, and Young's modulus of 300 GPa through strengthening local chemical bonds by the addition of oxygen. The high-oxygen-content specimens (2111 ppm) show exceptional corrosion resistance with a self-corrosion current density of 1.259 × 10^–7A/cm² in 3.5 wt. % NaCl solution. This can be attributed to the formation of a denser CoMoO₄ composite oxide layer and suppression of passive film dissolution. These findings could provide a comprehensive understanding of the effects of oxygen on the BMGs, and help with the development of high-performance and cost-effective Mo-based BMGs.

MoCoB大块金属玻璃（BMG）具有很高的热稳定性和优异的机械性能。然而，由于玻璃形成能力差和制备条件苛刻，特别是对低氧含量的要求，它们的广泛应用仍然受到限制。本研究系统地研究了氧对MoCoB BMG性能的影响。少量的氧气掺入（≤1064 ppm）显著提高了GFA，由于结晶的热力学驱动力降低，临界直径从1.2 mm增加到2mm。此外，添加676 ppm的氧同时通过添加氧增强局部化学键，使MoCoB BMG的显微硬度达到1347 HV，抗压强度达到5000 MPa以上，纳米硬度达到19 GPa，杨氏模量达到300 GPa，改善了MoCoB BMG的力学性能。高氧含量试样（2111 ppm）在3.5 wt. % NaCl溶液中自腐蚀电流密度为1.259 × 10-7A /cm2，表现出优异的耐腐蚀性。这是由于形成了更致密的CoMoO4复合氧化物层，抑制了钝化膜的溶解。这些发现有助于全面了解氧对bmg的影响，并有助于开发高性能、低成本的mo基bmg。

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引用次数: 0

Correlation between magnetic analyses and optical properties of divalent Co ion in boro-tellurite glass with erbium lanthanide 镧系铒硼碲玻璃中二价钴离子的磁性分析与光学性质的相关性

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2026-02-01 Epub Date: 2025-12-26 DOI: 10.1016/j.jnoncrysol.2025.123925

Nur Liyana Amiar Rodin , S.N. Syed Yaacob , N.A.M. Jan , Faiz Hashim , Siti Maisarah Aziz , R. Zainal , M.R. Sahar

This study investigates the optical and magnetic properties of Er³⁺-doped boro-tellurite glasses containing varying amounts of cobalt oxide nanoparticles (Co₃O₄ NPs). Glass samples with different Co₃O₄ concentrations (0.0–0.8 mol %) were prepared using the melt-quenching method. X-ray diffraction and HRTEM confirmed their amorphous structure, with lattice spacing matching the (422) plane of pure Co₃O₄. Magnetic analysis from VSM showed mainly paramagnetic behavior with slight ferromagnetic traces due to Co²⁺/³⁺ ions. EPR analysis indicated Co²⁺ ions in octahedral sites, showing strong superexchange interactions and high spin-orbit coupling. Adding Co₃O₄ NPs altered the electron distribution, increasing the optical bandgap and suggesting more tetrahedral Co²⁺ integration into the glass network. Up-conversion spectra revealed only two emission peaks (653 nm and 822 nm), with reduced luminescence at 538 nm and 554 nm. This quenching is attributed to intersystem crossing (ISC) of Co²⁺ ions in octahedral coordination, affecting the Er³⁺ emission behavior.

该研究研究了Er³+掺杂硼碲酸盐玻璃的光学和磁性能，该玻璃含有不同量的氧化钴纳米颗粒（Co₃O₄NPs）。采用熔淬法制备了不同Co₃O₄浓度（0.0 ~ 0.8 mol %）的玻璃样品。x射线衍射和HRTEM证实了它们的非晶结构，晶格间距与纯Co₃O₄的（422）平面相匹配。VSM的磁性分析主要显示出顺磁性行为，由于Co 2 + /³+离子的存在，有轻微的铁磁性痕迹。EPR分析表明，Co 2 +在八面体位点上，表现出强的超交换作用和高的自旋轨道耦合。Co₃O₄NPs改变了电子分布，增加了光学带隙，表明Co 2⁺更多地融入了玻璃网络。上转换光谱只有653 nm和822 nm两个发射峰，在538 nm和554 nm处发光减弱。这种猝灭归因于Co 2 +离子在八面体配位中的系统间交叉（ISC），影响了Er 3 +的发射行为。

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