Effect of Ba²⁺ ions substitution with Sr²⁺ ions on the dielectric properties of Ba_1−xSr_xTiO₃ ceramic solid solution

Abstract

The temperature dependences of the complex permittivity components ε′ and ε″ for Ba_1−xSr_xTiO₃ (0.1 ≤ x ≤ 0.7) solid solution obtained by two-stage ceramic technology were investigated. Both components ε′ and ε″ pass through the pronounced maxima near the Curie point. A growth of the ε′ maximum with an increase in the concentration of Sr atoms is associated with a reduction in the average grain size and an increase in the volume fraction of the intergranular layer having a lower ε′ compared to a grain. The increase in the diffusion of the phase transition with the concentration of Sr atoms is due to the greater heterogeneity of the solid solution. Based on the dielectric data, temperature dependences of the local order parameter were plotted.

Keywords:

• Barium strontium titanate
• diffused phase transition
• dielectric properties
• local order parameter

Additional information

Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation in the framework of the state assignment (Project No. FZGM-2023-0006).