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Electrical Properties of Ce0.8Dy0.175Ca0.025O2-δ

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Abstract

The present paper is focused on the structure, microstructure, and electrical properties of Ca (calcium)- and Dy (dysprosium)-doped ceria electrolyte materials. The CaDDC (Ce0.8Dy0.175Ca0.025O2-δ) sample was prepared through a modified sol–gel low-temperature process using sucrose and pectin. Rietveld analysis of powder x-ray diffraction (XRD) patterns confirms the cubic structure with a single phase. The Raman spectroscopy studies confirm the improved oxygen vacancies for the sample CaDDC over pure ceria. The scanning electron microscopy (SEM) images showed the highly dense surface. Energy-dispersive spectroscopy (EDS) confirms the sample chemical composition. Impedance spectroscopic studies were carried out to analyze the electrical properties. Migration energy (Em) and association energy (Easso.) were calculated from the dielectric relaxation process for oxide ion migration. Relaxation peaks were observed in tangent loss due to the presence of defect pairs. Modulus analysis showed a single relaxation peak, which indicates the reorientation of defect associates. The Ce0.8Dy0.175Ca0.025O2-δ sample exhibits improved conductivity of 1.23 × 10–2 S/cm at 600°C with an activation energy of 0.89 eV.

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  1. Department of Physics, GITAM School of Science, GITAM (Deemed to be University), Hyderabad, Telangana, 502329, India

    S. Ramesh

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Ramesh, S. Electrical Properties of Ce0.8Dy0.175Ca0.025O2-δ. Journal of Elec Materi 50, 4333–4345 (2021). https://doi.org/10.1007/s11664-021-08884-x

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  • DOI: https://doi.org/10.1007/s11664-021-08884-x

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