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Defect chemistry of highly defective La0.1Sr0.9Co0.8Fe0.2O3-Delta by considering oxygen interstitials

Title
Defect chemistry of highly defective La0.1Sr0.9Co0.8Fe0.2O3-Delta by considering oxygen interstitials
Authors
Im, H.-N.[Im, Ha Ni]Singh, B.[Singh, Bhupendra P.]Hong, J.-W.[Hong, Jae Woon]Kim, I.-H.[Kim, In Ho]Lee, K.T.[Lee, Kang Taek]Song, S.-J.[Song, Sun Ju]
DGIST Authors
Lee, K.T.[Lee, Kang Taek]
Issue Date
2016
Citation
Journal of the Electrochemical Society, 163(14), F1588-F1595
Type
Article
Article Type
Article
Keywords
Chemical AnalysisConductivity AnalysisConductivity MechanismsCrystal DefectsInterstitial DiffusionLanthanum CompoundsNegatively ChargedOxygenOxygen-Ion DiffusionOxygen InterstitialsOxygen VacanciesP-Type ConductionPerovskiteThermo-Electric PowerThermopower Measurements
ISSN
0013-4651
Abstract
In case of highly defective perovskite oxides such as La0.1Sr0.9Co0.8Fe0.2O3-δ (LSCF1982), the ionic defect has been in question by suggesting direct oxygen ion diffusion by considering lattice oxygen site as an interstitial rather than an oxygen vacancy. In the present study, the thermomigration of ionic defect species was measured by ionic thermopower measurement to provide strong evidence of interstitial diffusion and the defect structure was further analyzed in terms of effectively negatively charged oxygen interstitial as a charge-compensating defect against hole. Two kinds of holes-delocalized and localized at B-site cations; were investigated by defect chemical analysis. From the conductivity analysis based on the non-stoichiometry results, the contributions of delocalized holes, localized hole at Co site, localized hole at Fe site, and localized hole moving from Co site to Fe site were successfully separated, and it was observed that the hopping reaction involving hole localized at Co is dominant in conductivity mechanism. The measurement of electronic thermopower further confirms the involvement of two different types of holes in p-type conduction. © 2016 The Electrochemical Society. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/2764
DOI
10.1149/2.0951614jes
Publisher
Electrochemical Society
Related Researcher
  • Author Lee, Kang Taek Advanced Energy Conversion and Storage Lab(AECSL)
  • Research Interests
Files:
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Collection:
Energy Science and EngineeringAECSL(Advanced Energy Conversion and Storage Lab)1. Journal Articles


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