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High Temperature property of SOFC Materials-analysis of crystal structure under operating conditions-

High Temperature property of SOFC Materials-analysis of crys...

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第十二届中国固态离子学学术会议

作者： Takuya Hashimoto Norifumi Ohba eri oikawa Tomoya Shibasaki Department of Integrated Sciences in Physics and Biology College of Humanities and SciencesNihon University3-8-1SakurajousuiSetagaya-kuTokyo 156-8550Japan Nihon University3-8·1 SakurajousuiSetagaya-kuTokyo 1 56-8550Japan

Crystal structures of materials employed for solid oxide fuel cells at operating conditions have been examined using our originally designed high temperature X-ray diffraction apparatus with oxygen partial pressure, P(O2), control system The phase relationship of Ce1-xMxO2-δ(M=Gd, Sm and Y;x=0.0-0.2) which is expected to be a new electrolyte material for low temperature SOFC operation, on temperature, cation content and concentration of oxide ion vacancy have been proposed by X-ray dif&action at high temperatures under log P (O2) of 0--24. Structural phase transition of new electrolyte, La1-xSrxGa1-yMgyO3-δ, has also been analyzed and relationship between crystal structure and thermodynamic character of the phase transition has been clarified. Reduction expansion behavior of La1-xCaxCrO3-δ, which is employed as a interconnector of SOFC, has been examined. It was revealed that the origin of reduction expansion was oxide ion vacancy, which behaved as ideal solution at 8 lower than 0.03 and showed deviation from ideal solution model at d higher than 0.03.

关键词： X-ray diffraction phase transition Ce1-xMxO2-δ La1-xSrxGa1-yMgyO3-δ La1-xCaxCrO3-δ

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High Temperature Property of SOFC Materials Analysis of Crystal Structure under Operating Conditions

High Temperature Property of SOFC Materials Analysis of Crys...

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第十二届中国固态离子学学术会

作者： Takuya Hashimoto Norifumi Ohba eri oikawa Tomoya Shibasaki Shaorong Wang Department of Integrated Sciences in Physics and Biology College of Humanities and SciencesNihon University3-8-1 SakurajousuiSetagaya-kuTokyo 156-8550Japan Shanghai Institute of Ceramics Chinese Academy Shanghai 200050China

Crystal structures of materials employed for solid oxide fuel cells at operating conditions were been examined using our originally designed high temperature X-ray diffraction apparatus with oxygen partial pressure, p(O2) . The phase relationship of Ce1-xMxO2-δ(M = Gd, Sm and Y;x = 0. 0 - 0. 2 ) which is expected to be a new electrolyte material for low temperature SOFC operation, on temperature, cation content and concentration of oxide ion vacancy have been proposed by X-ray diffraction at high temperatures under 1gp(O2)of 0-24. Structural phase transition of new electrolyte, La1-xSrxGa1-yMgyO3-δ,was also analyzed and relationship between crystal structure and thermodynamic character of the phase transition was clarified. Reduction expansion behavior of La1-x CaxCrO3-δ, which is employed as a interconnector of SOFC, has been examined. It was revealed that the origin of reduction expansion was oxide ion vacancy, which behaved as ideal solution at δlower than 0. 03 and showed deviation from ideal solution model at δhigher than 0. 03.

关键词： X-ray diffraction phase transition Ce1-xMxO2-δ La1-xSrxGa1-yMg O3-δ La

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