Abstract
In the present study structural and electrical conductivity properties of complex perovskites with general formula Sr1−xKx(Sr0.50Nb0.50)O2.75−δ have been studied. Potassium is doped in the cuboctahedral Sr site Sr1−xKx(Sr0.50Nb0.50)O2.75−δ with different dopant concentrations such as x = 0, 0.25, 0.50, 0.75 and 1. The structural and morphological properties of Sr1−xKx(Sr0.50Nb0.50)O2.75−δ were studied using Thermogravimetry (TG) analysis, x-ray diffraction (XRD) and Scanning electron microscopy (SEM). Electrochemical impedance spectroscopy (EIS) was performed to investigate the electrical properties. The effect of structural and morphological variations associated with the dopant concentration affecting the electrical conductivity behaviour of Sr1−xKx(Sr0.50Nb0.50)O2.75−δ complex perovskite oxides were studied in detail. The higher total conductivity was observed for 100% K doped (x = 1, 3.10 × 10−5 S cm−1at 800 °C) and 25% K doped (x = 0.25, 2.02 × 10−5 S cm−1at 800 °C) composition.
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