Abstract
We investigated the effect of Ni doping on the structural and electrical properties of LaCoO3 . Single phase LaCo1-xNixO3 (x = 0, 0.1, 0.3, 0.5) were synthesized using solid state reaction method. Space group, lattice constants and atomic positions were determined by Rietveld refinement of powder diffraction data. The unit cell parameters found to increase with Ni doping. Four-probe direct current conductivity measurements were also carried out to investigate transport behavior of compounds. Samples were found to exhibit temperature dependent semiconducting behavior. The drastic improvement of the room-temperature conductivity of doped samples with respect to the pure compound has been observed and explained in terms of decrease in band gap. The transport mechanism in different regions of temperature has been investigated by fitting Arrhenius and variable range hopping (VRH) models.
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