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      Study of structural, electrical, and photoluminescent properties of SrCeO 3 and Sr 2CeO 4


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          Phase pure powders of SrCeO 3 and Sr 2CeO 4 have been synthesized by calcination at 1000 °C for 14 h via solid state ceramic route. Ceramics/pellets of these samples have been obtained by sintering at 1200 °C for 12 h. The Rietveld refinement of X-ray diffraction (XRD) pattern of sintered powders confirmed orthorhombic structure of both the samples with space group Pnma and Pbam for SrCeO 3 and Sr 2CeO 4, respectively. Scanning electron microscopic (SEM) studies indicated that both the compounds have dense microstructure, but morphology and size of the grains are different. The impedance spectroscopy technique has been employed to study the relaxation phenomenon. DC conductivity of the samples has been measured in the temperature range of 200–600 °C to understand the conduction mechanism. The activation energy for relaxation ( E relax) and DC conduction ( E cond) are found to be the same for both the compounds. Based on the numerical value of activation energies, relaxation and conduction mechanism in both the samples are attributed to migration of doubly ionized oxygen vacancies (V o ··). Photoluminescence technique has been employed to confirm the existence of oxygen vacancies. These studies have indicated that migration of oxygen vacancies in Sr 2CeO 4 is occurring mainly along a and c direction, i.e., via perovskite cells. Further, the present work has clearly indicated that besides optical properties, electrical properties of Sr 2CeO 4 are also interesting and can be utilized for various applications such as oxide ion conduction electrolyte in solid oxide fuel cells (SOFCs).

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          Author and article information

          J Adv Ceram
          Journal of Advanced Ceramics
          Tsinghua University Press and Springer-Verlag Berlin Heidelberg (USA )
          01 September 2019
          01 October 2019
          : 8
          : 3
          : 377-388
          aDepartment of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India
          Author notes
          *Corresponding author: Shail Upadhyay, E-mail: supadhyay.app@ 123456itbhu.ac.in
          Copyright © The Author(s)

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by/4.0/.

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