Structural Dependence of Conductivity in Rare Earth Doped Strontium Cobaltite Nanoparticles
Rare earth doped strontium cobaltite (Sr1 − x R x CoO3 − δ where R is rare earth element like cerium (Ce) (x = 0.0, 0.025)) was synthesized by a composite-mediated hydrothermal method (CMHM). X-ray diffraction (XRD) was done to study the structural properties such as crystal structure, crystallite size, lattice constants and phase purity of the samples. Phase transformation from monoclinic to the hexagonal structure was observed with heat treatment. DC electrical conductivity was studied as a function of temperature in the range from room temperature to 430°C. It was observed that DC electrical conductivity increased with increase in temperature and was explained by a hopping model. Impedance was measured as a function of temperature (30–600°C) at the frequency of 1 MHz. Different parameters were correlated to study the conductivity mechanism. The prepared samples are one of the suitable candidates for the cathode of intermediate temperature solid oxide fuel cells (ITSOFCs).
KeywordsRare earth Perovskite ITSOFCs Composite-mediated hydrothermal method Hopping
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