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Kim, Guntae
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Research Interests
  • Solid Oxide Fuel Cells (SOFCs)& SOE, PEMFC, metal-air batteries, Metal-CO2 system, Catalyst for DRM

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Oxygen non-stoichiometry, defect equilibrium and electrical properties of La0.8Sr0.2Sc0.2Mn0.8O 3±δ

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Title
Oxygen non-stoichiometry, defect equilibrium and electrical properties of La0.8Sr0.2Sc0.2Mn0.8O 3±δ
Author
Kim, GuntaeSengodan, SivaprakaKim, JunyoungShin, Jeeyoung
Issue Date
2013-01
Publisher
The Electrochemical Society
Citation
ECS Transactions, v.57, no.1, pp.1647 - 1654
Abstract
Non-stoichiometric variation of oxygen content in La0.8Sr 0.2Sc0.2Mn0.8O3±δ were determined by means of coulometric titration as a function of oxygen partial pressure p(O2) and temperature. La0.8Sr0.2Sc 0.2Mn0.8O3±δ oxides shows oxygen excess and oxygen deficient composition depending on p(O2). Random defect model was constructed based on the experimental oxygen non-stoichiometry. The non-stoichiometric variation of oxygen content of La0.8Sr 0.2Sc0.2Mn0.8O3±δ can be explained by the defect equilibrium model. Thermodynamic quantities such as partial molar enthalpy and partial molar entropy were calculated using Gibbs-Hemholtz equation. Electrical conductivity measurements were performed as a function of oxygen partial pressure and temperature, which shows a typical p-type behavior.
URI
https://scholarworks.unist.ac.kr/handle/201301/6139
URL
http://ecst.ecsdl.org/content/57/1/1647
DOI
10.1149/05701.1647ecst
ISSN
1938-5862
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