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dc.contributor.authorSingh, Sunder-
dc.contributor.authorKumar, Manindra-
dc.contributor.authorKumar, Anil-
dc.contributor.authorSaini, Deepash Shekhar-
dc.identifier.issn0975-0959 (Online); 0301-1208 (Print)-
dc.description.abstractIn the present research work, La0.5Sr0.5Bi0.2Co0.4Fe0.4O3– cathode ceramic powder is synthesized through cost-effective flash pyrolysis process and followed by conventional sintering for IT-SOFCs. The Rietveld refinement program is used to determine the crystal structure, unit cell parameters and bond length. The XRD result indicates existence of a pure single phase of rhombohedral structure with R3􀴤 C space group symmetry detected from the sample sintered at 700 ℃. FESEM micrographs of fracture surface of sample sintered at 700 ℃ showed a high porosity and nano grain sizes (50-100 nm). Combined impedance and electric modulus spectroscopic are used to investigate the relaxation phenomena in La0.5Sr0.5Bi0.2Co0.4Fe0.4O3– ceramic over a broad range of temperature and frequency. A single relaxation peak is observed in the imaginary part of impedance and electric modulus spectra, which could be due to the contribution of grain boundary of La0.5Sr0.5Bi0.2Co0.4Fe0.4O3– ceramic. The imaginary part of modulus (𝑀") spectra is studied with help of non-exponential decay function or Kohlrausch–Williams–Watts (KWW) parameter (β). In the combined plot of the imaginary part of impedance (𝑍") and electric modulus (𝑀") spectra at 210 ℃, only a single peak of 𝑍"and 𝑀" is observed at the same frequency which specifies that the conduction process is a long-range motion of the charge carriers. The frequencydependent conductivity is followed by the Jonscher’s double power law in the temperature range 30-210 ℃.en_US
dc.publisherNIScPR-CSIR, Indiaen_US
dc.sourceIJPAP Vol.59(08) [August 2021]en_US
dc.subjectCathode materialsen_US
dc.subjectGrain boundaryen_US
dc.subjectElectric modulusen_US
dc.subjectJonscher’s double power lawen_US
dc.titleImpedance and Electric Modulus Spectroscopy of Polycrystalline La0.5Sr0.5Bi0.2Co0.4Fe0.4O3– Cathode Ceramic for Intermediate Temperature SOFCsen_US
Appears in Collections:IJPAP Vol.59(08) [August 2021]

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