Synthesis, structure, oxygen stoichiometry, and electrical properties of doped ruddlesden-popper strontium cobaltite Sr(1·875)Ce(0·025)CoO(4-δ), Sr(1·875)Ce(0·025)Co(0·75)Ni(0·25)O(4+δ) novel compounds

We report the synthesis of Sr(1·875)Ce(0·025)CoO(4-δ) and Sr(1·875)Ce(0·025)Co(0·75)Ni(0·25)O(4+δ) for the first time, each compound was synthesised using Co-precipitation and Sol-Gel methods, at 1050 °C for 144 and 120 h respectively. Oxygen stoichiometry was determined using Iodometric titration, we have noticed oxygen hypostoichiometry for Ce-doped compound and hyperstoichiometry state after Ni-doping. Electrical properties were studied for sintered pellets, Electrical resistance was measured in the range (−0.5–+0.5 v). Specific electrical resistivity and electrical conductivity were calculated from resistance measurements. It was found that the Ce-doped compound has about three times higher conductivity (σ(C1) = 0.000000058423295 s cm(−1)) Compared with the Ni-doped one (σ(N2) = 0.000000022384787 s cm(−1)). Electrical Capacitance was measured at 1 kHz frequency, the relative dielectric constant ε(r), and the loss tangent tanδ were calculated accordingly. The results showed that the Ni-doped compound has higher capacitance but lower ε(r) and dissipation factor values.