STRUCTURAL AND ELECTRICAL PROPERTIES OF LaCo_1-xNi_xO₃

Abstract

We investigated the effect of Ni doping on the structural and electrical properties of LaCoO 3 . Single phase LaCo 1-x Ni x O 3 (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.

Dual‐Defects Adjusted Crystal‐Field Splitting of LaCo1−xNixO3−δHollow Multishelled Structures for Efficient Oxygen Evolution

“…Its worth noting that the unit cell volume gradually become larger with the Ni substitution (Figure 2 c and Table S5), which is attributed to the larger radius of nickel ion than cobalt ion. [15] More interestingly, the trend similar to surface oxygen vacancy concentration is observed in the deformation of crystal structure, the differ-…”

Dual‐Defects Adjusted Crystal‐Field Splitting of LaCo1−xNixO3−δHollow Multishelled Structures for Efficient Oxygen Evolution

“…2.1 %), which has been confirmed by iodometric titration. It's worth noting that the unit cell volume gradually become larger with the Ni substitution (Figure c and Table S5), which is attributed to the larger radius of nickel ion than cobalt ion . More interestingly, the trend similar to surface oxygen vacancy concentration is observed in the deformation of crystal structure, the difference of the lattice a/c ratio between the 3S‐LCN− x HoMSs and the pure 3S‐LC (LaCoO 3‐δ ) HoMSs is the highest when the x value (Ni substitution ratio) is 0.5 (Figure c).…”

Thermal properties of Ni-substituted LaCoO3 perovskite

“…[5] for LaCo 1-x Ni x O 3 . We have applied MRIM to compute the model parameters (b, ρ) and thermal properties of these cobaltates and Atoms in Molecule (AIM) theory [6] to compute bulk modulus on the similar lines as described earlier [3][4].…”