Oxygen non-stoichiometry, defect equilibrium and electrical properties of La0.8Sr0.2ScyMn1-yO3±δ (y = 0.2, 0.3, 0.4)
- Author(s)
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Kim, Guntae, Sengodan, Sivaprakash, Shin, Jeeyoung
- Issued Date
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2012-10-18
- URI
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https://scholarworks.unist.ac.kr/handle/201301/43240
- Citation
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2012 한국 세라믹 학회 추계 연구발표회
- Abstract
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Non-stoichiometric variation of oxygen content in La0.8Sr0.2 ScyMn1-yO3±δ (y = 0.2, 0.3, 0.4) were determined by means of coulometric titration as a function of oxygen partial pressure p(O2) and temperature. La0.8Sr0.2ScyMn1-yO3±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 La0.8Sr0.2ScyMn1-yO3±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.
- Publisher
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한국 세라믹 학회
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