Study of structural, electrical, and photoluminescent properties of SrCeO3 and Sr2CeO4

Dharmendra Yadav; Upendra Kumar; Shail Upadhyay

doi:10.1007/s40145-019-0320-x

Journal of Advanced Ceramics 2019, 8(3): 377-388 https://doi.org/10.1007/s40145-019-0320-x

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Open Access | Issue | Published: 01 August 2019

Study of structural, electrical, and photoluminescent properties of SrCeO₃ and Sr₂CeO₄

Show Author's Information Hide Author's Information Dharmendra Yadav, Upendra Kumar, Shail Upadhyay(

)

Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India

Keywords:

Sr₂CeO₄, SrCeO₃, impedance spectroscopy, DC conductivity

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Yadav D, Kumar U, Upadhyay S. Study of structural, electrical, and photoluminescent properties of SrCeO₃ and Sr₂CeO₄. Journal of Advanced Ceramics, 2019, 8(3): 377-388. https://doi.org/10.1007/s40145-019-0320-x

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Abstract

Phase pure powders of SrCeO₃ and Sr₂CeO₄ have been synthesized by calcination at 1000 ℃ for 14 h via solid state ceramic route. Ceramics/pellets of these samples have been obtained by sintering at 1200 ℃ 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 SrCeO₃ and Sr₂CeO₄, 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 ℃ 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 Sr₂CeO₄ 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 Sr₂CeO₄ 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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Study of structural, electrical, and photoluminescent properties of SrCeO₃ and Sr₂CeO₄

Show Author's information Hide Author's Information Dharmendra Yadav, Upendra Kumar, Shail Upadhyay(

)

Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India

Abstract

Keywords: Sr₂CeO₄, SrCeO₃, impedance spectroscopy, DC conductivity

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Publication history

Received: 19 October 2018

Revised: 24 January 2019

Accepted: 09 February 2019

Published: 01 August 2019

Issue date: September 2019

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Acknowledgements

The authors are grateful to the Head, Department of Physics and Coordinator, Central Instrument Facility Centre (CIFC) and Co-ordination, Centre for energy research and development (CRED), IIT(BHU), Varanasi for providing the experimental facilities required for the characterization of samples. Dharmendra Yadav and Upendra Kumar are thankful to the Ministry of Human Resource and Development (MHRD), the Government of India and co-ordinator for the financial support in terms of Senior Research Fellowship (SRF).

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