  The crossover between two different conduction mechanisms (variable range and
small polaron hoppings) is probed utilizing a conjunction of thermally varying
conductivity and impedance in polycrystalline Pr2NiTiO6 (PNT). A combination of
X-ray diffraction (XRD) and Raman spectroscopic investigations authenticates
the lower symmetric monoclinic structure for PNT. The conductivity, impedance
and relaxation spectra highlight the combined contributions of the electrodes,
grain-boundaries and grain microstructures to the carrier dynamics in PNT. The
relaxation mechanism has a non-ideal nature with distribution of relaxation
times as observed from the dielectric and impedance spectroscopic data. The dc
resistivity investigation points towards a transition in the conduction
mechanism showing a gradual crossover at temperature 490 K, from small polaron
hopping to Mott s variable range hopping due to reduced activation energy.
