| Project/Area Number |
12450262
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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 | Tohoku University |
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Principal Investigator |
YUGAMI Hiroo Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (60192803)
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| Co-Investigator(Kenkyū-buntansha) |
KAWADA Tatsuya Institute of Multidisciplinary Research for Advanced Materials, Associate professor, 多元物質科学研究所, 助教授 (10271983)
SETA Noriko Graduate School of Engineering, Associate professor, 大学院・工学研究科, 助教授 (20271984)
TSUREKAWA Sadahiro Graduate School of Engineering, Associate professor, 大学院・工学研究科, 助教授 (40227484)
YAMAGUCHI Sadae Research Institute, Chiba Institute of Technology, Professor, 研究所, 教授 (80005892)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥14,900,000 (Direct Cost: ¥14,900,000)
Fiscal Year 2002: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2001: ¥10,400,000 (Direct Cost: ¥10,400,000)
Fiscal Year 2000: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | Solid electrolyte / Ion conductor / Nano-structure / artificial lattice / micro machining / Ion dynamics / Laser abrasion / レーザーアブレーション |
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| Research Abstract |
High temperature energy conversion systems for example solid oxide fuel cells (SOFC) etc have great potentials for high efficiency energy systems. However, there are several points of problems for practical application in wide application fields. In this study, the interface properties of solid state electrolyte materials is controlled by fabricating the artificial superlattice structures. Furthermore, the interface of ceramics of electrical conducting materials is also investigated by Kelvin probe force microscopy, in order to clear the relationship between the grain boundary natures and electrical conductivity. The following results are obtained;
(1) Nano-structured perovskite-type proton conducting thin films have been fabricated by SF_6 fast atom beam etching, with an ordered anodic porous alumina membrane as a lithographic mask. 100 and 500 nm period hexagonal structures are patterned on laser ablation deposited SrCeO_3 film on MgO (110) substrate. It is found from x-ray diffraction analysis that the lattice constant a, which is perpendicular to the substrate surface, decreases with decreasing periodicity of the nano-structure. The optical transmission and reflection spectra show typical features of surface-relief grating structures.
(2) Surface potential of individual grain boundaries of Nb-doped SrTiO_3 which has been considered a candidate of anode material of SOFC are evaluated by Kelvin probe force microscopy, without contacting to sample. Systematically investigation of the relationship between surface potential and grain boundary character, it is found that the surface potential at random boundary is quite different from other gain boundary types.
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