| Project/Area Number |
24246107
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | Tokyo Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
ISHIHARA Tatsumi 九州大学, 工学(系)研究科(研究院), 教授 (80184555)
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| Co-Investigator(Renkei-kenkyūsha) |
FUJII Kotaro 東京工業大学, 大学院理工学研究科, 助教 (30635123)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥42,250,000 (Direct Cost: ¥32,500,000、Indirect Cost: ¥9,750,000)
Fiscal Year 2014: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2013: ¥22,230,000 (Direct Cost: ¥17,100,000、Indirect Cost: ¥5,130,000)
Fiscal Year 2012: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
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| Keywords | イオン伝導 / 結晶構造解析 / 新物質探索 / イオン拡散経路 / ペロブスカイト / イオン伝導体 |
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| Outline of Final Research Achievements |
Summary of our research project entitled, "Structure design of ion conducting d10 metal oxides", is described here. The role of d10 Ga in Pr2(Ni,Cu,Ga)O4 oxide-ion conducting material was investigated. We found that the interstitial oxygen amounts (carrier concentration) are increased by doping the higher valence of Ga3+ compared with Ni2.5+. We have explored new structure family of oxide-ion conducting materials with AA'BO4 compositions and we discovered a new structure family NdBaInO4. Sr doping into NdBaInO4 improved oxide-ion conductivity. Oxide-ion diffusion pathway was visualized for Pr2(Ni,Cu,Ga)O4, PrBaCo2O5.5+delta and Ce0.5Zr0.5O2. In Pr2(Ni,Cu,Ga)O4 and PrBaCo2O5.5+delta, two-dimensional diffusion pathway was observed. The thermal expansion anisotropy of K2NiF4-type A2BO4 oxides was also investigated at an atomic scale. The anisotropic thermal expansion is attributable to anisotropic B-O bonding, from view points of interatomic distance, electron density and bond valence.
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