Effect of Strontium Dopant on Dielectric Properties of BaTiO3

Md Asif Shahriar; Md Mahfuzul Haque; Md. Mostafizur Rahman Suruj; Md Miftaur Rahman

doi:10.38032/scse.2026.4.224

Authors

Md Asif Shahriar Department of Materials and Metallurgy Engineering, Bangladesh University of Engineering and Technology ( BUET), Dhaka- 1000 , Bangladesh
Md Mahfuzul Haque Department of Materials and Metallurgy Engineering, Bangladesh University of Engineering and Technology ( BUET), Dhaka- 1000 , Bangladesh
Md. Mostafizur Rahman Suruj Department of Nanomaterials and Ceramic Engineering, Bangladesh University of Engineering and Technology ( BUET) , Dhaka- 1000 , Bangladesh . Department of Ceramic and Metallurgy Engineering ,Rajshahi University of Engineering and Technology, Rajshahi-6204, Bangladesh .
Md Miftaur Rahman Department of Mechanical Engineering, Chittagong University of Engineering and Technology, Chattogram-4349, Bangladesh

DOI:

https://doi.org/10.38032/scse.2026.4.224

Keywords:

Barium titanate (BaTiO3), Advanced Ceramics, Spinel Structure, Dielectric, Piezoelectric, Dielectric loss

Abstract

Strontium-doped barium titanate (Ba₁₋ₓSrₓTiO₃, BST) ceramics with Sr concentrations of 1%, 3%, and 5% were successfully synthesized using the conventional solid-state reaction method. High-purity barium carbonate (BaCO₃), strontium carbonate (SrCO₃), and titanium dioxide (TiO₂) powders were thoroughly mixed and milled for 24 hours, followed by pellet formation and sintering at 1150–1250 °C for 2 hours. The phase composition, microstructure, and dielectric properties of the samples were systematically investigated. X-ray diffraction (XRD) confirmed the formation of a single-phase perovskite structure, with a tetragonal-to-cubic phase transition observed as Sr content increased. The lattice parameters decreased with Sr incorporation due to the smaller ionic radius of Sr²⁺ (1.16 Å) compared to Ba²⁺ (1.36 Å), confirming successful A-site substitution. The dielectric constant increased from pure BaTiO₃ to 3 mol% Sr, Add quantitative comparison of dielectric loss values and clarify the test frequency. The optimized 3 mol% Sr composition exhibited enhanced crystallinity, high relative density, and low dielectric loss, indicating superior dielectric performance. These findings demonstrate that controlled Sr²⁺ substitution effectively tailors the structural and dielectric properties of BaTiO₃, making Ba₀.₉₇Sr₀.₀₃TiO₃ a promising lead-free dielectric material for advanced capacitor and transducer applications.

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