<p>This study explores the structural, dielectric, and electrical characteristics of a lead-free ceramic system with a chemical composition of Sr_0.6Ba_0.4Nb_2(1−x)Ta_2xO₆ (x = 0, 0.02, 0.04, and 0.06) synthesized via a solid-state reaction technique. X-ray diffraction (XRD) analysis confirmed the development of pure crystalline phases characterized by monoclinic and tetragonal symmetries. This substitution caused slight modifications to the lattice parameters. Dielectric studies indicated that the Curie temperature (T_c) initially increased with Ta doping up to x = 0.04, indicating an optimal level for enhanced ferroelectric properties before decreasing at x = 0.06. The materials exhibited a diffuse phase transition, as confirmed by the modified Curie-Weiss law. Impedance and electric modulus spectroscopy studies revealed a non-Debye-type relaxation mechanism and a negative temperature coefficient of resistance (NTCR). The grain resistance decreased with increasing temperature, suggesting a thermally activated conduction process. The analysis of the DC and AC conductivities confirmed that ionic conduction was the dominant mechanism, with the activation energies influenced by Ta⁵⁺ substitution. These findings suggest that Ta doping effectively tunes the properties of Sr_0.6Ba_0.4Nb_2(1−x)Ta_2xO₆, making it a viable option for electronic components such as resonators and capacitors.</p>