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Review Issue
Multiscale Strategies Integrating Topological Constraint Theory, Molecular Dynamics, and Machine Learning for High-Performance Glass Design
Journal of the Chinese Ceramic Society 2025, 53(10): 2882-2898
Published: 02 July 2025
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Topological constraint theory (TCT) establishes quantitative predictive models linking the microscopic structure and macroscopic properties of glass via quantifying atomic-scale bonding constraints. Molecular dynamics (MD) simulations, utilizing force field models, enable the exploration of dynamic structural evolution across temporal scales from nanosecond-level structural relaxation to microsecond-level phase separation dynamics. Machine learning (ML) algorithms construct high-dimensional composition-property mappings, thus opening a paradigm for inverse glass design based on targeted performance requirements.

This review first elaborates on the fundamental principles of TCT and its pivotal role in predicting glass transition temperature, analyzing thermal expansion behavior, evaluating hardness, and uncovering the mechanisms of the mixed-alkali effect. Subsequently, it highlights the innovative research conducted by using MD simulations, i.e., structural optimization of encapsulation glasses for high-pressure power devices, mechanical reinforcement mechanisms of high-strength glass fibers, and dielectric property modulation of glass substrates for high-frequency electronic applications as well as the applications in glass ceramics. Finally, this review discusses the emerging paradigms of ML in glass property prediction and envisions the synergistic integration of TCT, MD, and ML in the development of next-generation glass materials.

Summary and Prospects

TCT via quantifying the types and numbers of atomic constraints within the glass network effectively reveals the intrinsic correlation between glass structure and macroscopic properties. It provides a solid theoretical foundation for understanding and tailoring glass performance, offering a significant potential for the development of high-performance glass materials. Under the guidance of this theoretical framework, MD simulation serves as a powerful tool for investigating the atomic-scale structure and dynamic behavior of glasses, thereby offering an effective pathway to establish structure-property relationships. However, TCT is often limited to specific systems, which can introduce errors when applied to complex compositions. Meanwhile, MD simulations are computationally expensive and sometimes suffer from the absence of accurate potential functions. Several limitations still hinder their broader application i.e., a) insufficient temporal resolution. Femtosecond-level time steps are inadequate for resolving high-frequency transient polarization responses; b) force fields often simplify quantum effects-current models, and fail to accurately describe local charge fluctuations and dynamic polarizability; and c) Limited spatial scales. Nano-sized models cannot fully capture structural heterogeneity, and statistical convergence under high-frequency electric fields is constrained by available computational power. MD simulations remain inadequate for directly investigating glass performance under high-frequency applications. To overcome these challenges, multiscale coupling models are needed, such as integrating ML algorithms to enhance the accuracy of polarization dynamics through deep learning-based potential functions, and employing materials informatics to accelerate the screening of high-performance glass compositions. These strategies are expected to significantly improve the efficiency of rational glass design.

Glass-ceramics, which evolve from glasses, are widely used in applications such as encapsulation materials, printed circuit boards, microwave components, sealing glasses, and low-temperature co-fired ceramic (LTCC) substrates, having a considerable value in high-frequency communications, microelectronic packaging, and power devices. The existing research on the crystallization phenomena in glass-ceramics mainly follows two technical pathways, i.e., a) employing structural characterization methods in combination with diffusion kinetics simulations and experimental validation to indirectly infer crystal precipitation behavior, and b) constructing glass-ceramic models in MD systems by manipulation strategies such as “dig-insert” or “cut-combine” approach. However, these approaches remain inherently limited to either indirect representations of crystalline formation or manually constructed models. Overcoming the existing technological bottlenecks to enable real-time visualization of crystal nucleation and growth mechanisms during dynamic simulations remains a critical challenge.

Finally, in the context of advanced packaging and heterogeneous integration, glass substrates play a crucial role in 3D integration, but face multiple challenges in interfacial reaction dynamics with silicon/metal substrates. These include atomic-scale interdiffusion leading to dielectric degradation, cross-scale coupling between nano scale chemical bond reconstruction and macroscopic stress evolution, as well as non-equilibrium thermodynamic effects induced by laser-assisted processing. There is an urgent need to develop simulation frameworks that integrate co-evolution of multiple properties across scales, enabling quantitative prediction of atomic interdiffusion coefficients, chemical bond reconstruction energy barriers, and residual stress distributions. Such efforts will provide the theoretical foundation for the design and process optimization of high-reliability glass substrates.

Open Access Research paper Issue
Designing a glass nanoshell on barium titanium trioxide to suppress nanocrystal growth during sintering for fine-grain dielectric ceramics
Journal of Materiomics 2025, 11(2): 100883
Published: 29 May 2024
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Barium titanate (BaTiO3, BT) is one of the key dielectric materials for multilayer ceramic capacitor (MLCC) industry. To meet the development trend of miniaturization and high capacity of MLCC, the sintered ceramic with nanosized grain is required. Herein, we demonstrate a controllable preparation of finegrain BaTiO3 ceramic by using sol-gel glass encapsulation strategy to suppress the growth of nanocrystal during sintering. It is found that the BaTiO3 nanocrystal with average lateral particle size of 70 nm and 200 nm (BT70 and BT200) can be coated with Bi2O3-B2O3-SiO2 (BBS) glass shell to form core-shell structures. The fine crystal of barium titanate ceramics can be achieved under different encapsulation quantities and sintering temperature. However, BT70, with a larger specific surface area, higher reactivity, and lower crystallinity, was more prone to hydrolyze in the sol-gel process, leading to the formation of a new phase after sintering, Ba2TiSi2O8, which adversely affected both the sintering behavior and dielectric properties. On the other hand, BT200 exhibited lower possibility to hydrolyze in the sol-gel process, resulting in single-phase ceramics after sintering. When the BT200 coated with 5% (in mass) BBS was sintered at 1100 ℃, a dense BaTiO3 ceramic were obtained, with dielectric constant of 1194.23 and loss of 0.0139 at room temperature and 1 kHz. Therefore, this work provides a robust strategy for suppressing the nanocrystal growth during sintering for MLCC applications.

Issue
Effect of Al2O3 Substituting SiO2 on Structure and Properties of Aluminosilicate Glass via Molecular Dynamics Analysis
Journal of the Chinese Ceramic Society 2022, 50(4): 886-893
Published: 22 March 2022
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The influence of Al/(Al+Si) molar ratio on the short-/mid-range structure and elastic modulus of alkali aluminosilicate glass was investigated via molecular dynamics simulation. The results show that the non-bridging oxygen in the glass network transforms to bridging oxygen and triple-bonded oxygen as the ratio of Al/(Al+Si) increases. When the ratio of Al/(Al+Si)>0.3, the non-bridging oxygen mainly changes to triple bond oxygen. The structural units transform to a high degree of polymerization, the connectivity of the glass network increases, and the elastic modulus of the glass increases as the ratio of Al/(Al+Si) increases. The elastic modulus of glass increases with the increase of Al/(Al+Si) molar ratio. The data calculated by the simulation are consistent with the experimental results, thus verifying a feasibility of using the molecular dynamics simulation to improve the glass composition.

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