  The ac electrical transport properties of polycrystalline Pr$_2$MgZrO$_6$
(PMZ) have been investigated using conductivity and impedance spectroscopic
techniques. The crystal structure of PMZ has been determined to be monoclinic
through a combination of X-ray diffraction and Raman spectroscopic studies. Ag
mode in the Raman spectra has been identified as the breathing vibration of the
ZrO6 octahedra. The ac conductivity spectra of PMZ exhibit distinct
characteristics at different temperature ranges. At lower temperatures (less
than 420 K), the spectra are fitted using a double power law, indicating the
involvement of multiple microstructural features. On the other hand, at higher
temperatures (greater than 460 K), the spectra follow Jonscher's law,
suggesting a simpler conduction mechanism. Through the analysis of
conductivity, permittivity, and impedance, an insulator-metal transition has
been observed around 452 K. This transition signifies a significant change in
the electrical properties of PMZ and provides valuable insights into its
conductive nature.
