Effect of Sr Substitution on Structure and Thermal Diffusivity of Ba_1-xSr_xTiO₃ Ceramic

Problem statement: The aim of this research was to study the effect of Sr substitution on structure and thermal diffusivity of Ba_l-xSr_xTiO₃ ceramic at room temperature. Approach: Structural and thermal diffusivity of Ba_1-xSr_xTiO₃ were studied by performing X-ray diffraction and photoflash measurements. The effects of Sr substitution on the structure and on the thermal diffusivity of Ba_1-xSr_xTiO₃ (0≤x≤1) were investigated. All samples were prepared by standard solid state reaction technique. Results: The results showed that by substituting of Ba²⁺ ion with the Sr²⁺ the crystallite size decreased. The effect made the thermal diffusivity of Ba_1-xSr_xTiO₃ decreased from 11.30x10^-3 cm² sec^-1 (for BaTiO₃) to 6.467x10^-3 cm² sec^-1 (for SrTiO₃) as x varied from 0-1. Conclusion: This study showed a significant effect of structure on thermo-physical property of materials.