<p>Diphosphate compounds exhibit a wide range of electrical characteristics, which makes them highly useful for numerous technological applications. In this work, the diphosphate compound Ag_0.2Na_0.8FeP₂O₇ was synthesized via the solid-state reaction method and comprehensively characterized using a range of analytical techniques. X-ray diffraction analysis confirmed the formation of a single-phase monoclinic structure, belonging to the P2₁/c space group. The electrical properties of the material were investigated, revealing conductivity behavior that aligns with Jonscher’s universal power law. The variation in AC conductivity and the frequency exponent <i>s</i> with temperature was accurately interpreted within the framework of the correlated barrier hopping model. Furthermore, the study addressed the contributions of single-polaron and bipolaron hopping mechanisms to the AC conductivity and examined the correlation between the compound’s ionic conductivity and its structural features. The temperature-dependent conductivity analysis of Ag_<i>x</i>Na_1−<i>x</i>FeP₂O₇ reveals that increasing sodium content systematically lowers the activation energy and enhances ionic transport, as evidenced by both DC and AC conductivity measurements. AC conductivity data across multiple frequencies are best described by a combined single-polaron and bipolaron hopping model, highlighting the complex and tunable nature of charge transport mechanisms in these phosphate-based materials. The compound exhibits excellent potential for laser host and energy storage applications due to low dielectric loss at high frequencies. These findings provide valuable insights into the unique electrical properties of Ag_0.2Na_0.8FeP₂O₇ and its potential fields of utilization.</p>