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

Defect chemistry of highly defective La0.1Sr0.9Co0.8Fe0.2O3-Delta by considering oxygen interstitials
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
Journal of the Electrochemical Society, 163(14), F1588-F1595
Article Type
Chemical AnalysisConductivity AnalysisConductivity MechanismsCrystal DefectsInterstitial DiffusionLanthanum CompoundsNegatively ChargedOxygenOxygen-Ion DiffusionOxygen InterstitialsOxygen VacanciesP-Type ConductionPerovskiteThermo-Electric PowerThermopower Measurements
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.
Electrochemical Society
Related Researcher
  • Author Lee, Kang-Taek AECSL(Advanced Energy Conversion and Storage Lab)
  • Research Interests Advanced energy conversion and storage systems; Solid-state Electrochemical Energy Devices; All solid-state batteries; low-temperature solid oxide fuel cells(SOFCs); 신 에너지 변환 및 저장 시스템; Solid-state Electrochemical Energy Devices; 차세대 전고체 이차전지(solid-state batteries) 및 저온화 고체산화물 연료전지(LT-SOFCs)
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Department of Energy Science and EngineeringAECSL(Advanced Energy Conversion and Storage Lab)1. Journal Articles

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