| Project/Area Number |
17H03391
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
Kagomiya Isao 名古屋工業大学, 工学(系)研究科(研究院), 准教授 (40318811)
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| Co-Investigator(Kenkyū-buntansha) |
松田 巌 東京大学, 物性研究所, 准教授 (00343103)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2018: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
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| Keywords | 混合導電性セラミックス / 酸素透過性セラミックス / 混合導電性酸化物 / 表面交換反応 |
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| Outline of Final Research Achievements |
This study investigated systematic relation between oxygen permeation flux JO2 and Ca content in La1-xCaxFeO3-d(LCF). The x=0.35 sample showed the highest JO2 in the LCF. The ion conductivity and surface exchange reaction of x=0.35 sample was obtained by simultaneous investigation of the oxygen permeation flux and oxygen chemical potential on the sample surface.
JO2 of x=0.35 at 800 and 850 ℃ was found to be limited by surface exchange reaction on the low oxygen partial pressure side. The rate-determining step for the surface exchange reaction is charge transfer relating to O2 molecule desorption, resulting from the lower hole(Fe4+) concentration on the low oxygen partial pressure side under the reduction condition. The increase in hole concentration under the reduction condition is a possible strategy to improve the surface exchange reaction.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、La1-xCaxFeO3-d(LCF)について系統的に調べることで、ある特定の組成領域(x=0.3-0.4)で高い酸素透過性を示すことを見出した。この結果は高い酸素透過性に寄与すると考えられてきたSr,Coを含有しなくとも、学術的な観点から、格子自由体積、酸素欠陥量を制御することで透過性向上が可能であることを示したものである。この系では800℃以下では表面交換反応が律速となるが、この律速要因を突き止め、これより今後の表面交換反応の速い酸素透過性セラミックスの開発のために有効な学術指針を提供することができた。
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