The binary system of PZN (lead zinc niobate, Pb( \({Zn}_{1/3}{Nb}_{2/3}\) )O3) and bismuth ferrite BiFeO3 (BF) is fabricated by solid-state reaction technique. The structural investigation by XRD study confirms the formation of pyrochlore α-BZN as a major phase. Dielectric and complex impedance spectroscopy (CIS) is employed to examine the effect of pyrochlore phase on electrical performance of PZN-BF solid solution. SEM micrographs reveal appropriate distributions of grains and grain boundaries. The dielectric response of 0.5PZN-0.5BF solid solution with varying temperature from room temperature (30 \(^\circ {\text{C}}\) ) to 400 \(^\circ {\text{C}}\) and frequency from 1 kHz-1 MHz shows nearly constant loss (NCL) behavior in low-temperature region due to the localized motion of charge carriers and at the high-temperature side, relaxation due to hopping of charge carriers gives rise to high conductivity and maximum loss is observed. The dielectric relaxation process is observed from \(Z^{\prime \prime}\) spectra, and the conductivity relaxation are verified from the loss modulus ( \(M^{\prime \prime}\) ) spectra. The depressed semicircles in the Cole-Cole plot affirm the presence of a non-Debye type relaxation process. Investigation of the structural and transport characteristics of the 0.5PZN-0.5BF solid solution provides insight into their application in sensors, actuators, and optoelectronic devices.
