<p>A series of Sr²⁺ substituted BaTiO₃, i.e., Ba_1-xSr_xTiO₃(x = 0.05–0.2), was prepared by the solid-state reaction technique. The structural study was done by XRD and Raman spectroscopy, which confirmed the formation of a tetragonal crystal structure. The microstructural study showed a decrease in grain size attributed to the lower ionic radii of Sr²⁺. The dielectric properties over a wide range of temperatures (25–350°C) are measured and discussed. With the increase in Sr²⁺ content, the dielectric constant and transition temperature decrease, while the bandgap increases. Ferroelectric property and energy storage performance are evaluated by measuring the P-E hysteresis loops.</p> Graphical Abstract <p></p>