Electrical transport properties of LiNiV O4 ceramics

The LiNiV O4 fine powder has been synthesized by chemical “pyrophoric reaction process”. The formation of LiNiV O4 is confirmed by X-ray diffraction analysis. X-ray analysis shows that the compound has cubic crystal structure with lattice constant (a=8.2243(2)Å). Microstructure of the sintered pellet is identified by taking the field emission scanning electron microscopy (FE-SEM) pictures, which reveals the grain size as ∼0.2-2 μm. Electrical properties are measured using complex impedance spectroscopy technique. Bulk contribution to electrical response is identified by the analysis of complex plane diagrams. The activation energy calculated from σdc vs 103/T graph is ∼0.06 eV (25-225 ∘C) and ∼0.55 eV (225-375 ∘C). Complex modulus study shows non-Debye type (polydispersive) conductivity relaxation in the compound.