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<p>In this study, Ba<sub>0.5</sub>Sr<sub>0.5</sub>TiO<sub>3</sub> (BST) ceramics with alkali-free multi-component (Ba–B–Al–Si) glass were developed and their properties were investigated. Oxalate co-precipitation method has been applied to obtain BST nanopowders. The powders with different grain sizes were employed to fabricate BST/Ba–B–Al–Si glass composites. The parameters, such as the sintering temperature, dielectric constant and breakdown strength were studied. The result indicated that the dielectric constant decreased with decreasing grain size, while the breakdown strength increased, compared with coarse-grained composites, the breakdown strength of 60&#xa0;nm fine-grained composites increased by 30%. Electric field simulations were performed using Ansys Maxwell software to calculate and visualize the electric field distribution within the BST/Ba-B-Al-Si glass composites material. Electric field simulation results demonstrate that ceramics with fine-grains exhibit a more uniform electric field distribution, thus possessing a higher breakdown strength compared to coarse grains, which closely aligns with our experimental measurements.</p> Graphical abstract <p></p>

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Grain size effect on the dielectric property of Ba0.5Sr0.5TiO3 ceramic/barium boroaluminosilicate glass composites

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Guoping Deng,
  • Hua Hao,
  • Zhonghua Yao,
  • Minghe Cao,
  • Hanxing Liu

摘要

In this study, Ba0.5Sr0.5TiO3 (BST) ceramics with alkali-free multi-component (Ba–B–Al–Si) glass were developed and their properties were investigated. Oxalate co-precipitation method has been applied to obtain BST nanopowders. The powders with different grain sizes were employed to fabricate BST/Ba–B–Al–Si glass composites. The parameters, such as the sintering temperature, dielectric constant and breakdown strength were studied. The result indicated that the dielectric constant decreased with decreasing grain size, while the breakdown strength increased, compared with coarse-grained composites, the breakdown strength of 60 nm fine-grained composites increased by 30%. Electric field simulations were performed using Ansys Maxwell software to calculate and visualize the electric field distribution within the BST/Ba-B-Al-Si glass composites material. Electric field simulation results demonstrate that ceramics with fine-grains exhibit a more uniform electric field distribution, thus possessing a higher breakdown strength compared to coarse grains, which closely aligns with our experimental measurements.

Graphical abstract