| Project/Area Number |
13450307
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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 |
Metal making engineering
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| Research Institution | The University of Tokyo (2003)
Nagoya Institute of Technology (2001-2002) |
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Principal Investigator |
YAMAGUCHI Shu The University of Tokyo, Graduate School of Engineering, Professor, 大学院・工学系研究科, 教授 (10182437)
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| Co-Investigator(Kenkyū-buntansha) |
HIGUCHI Touru Tokyo University of Science, Faculty of Science, Research Associate, 理学部, 助手 (80328559)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥15,100,000 (Direct Cost: ¥15,100,000)
Fiscal Year 2003: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2002: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2001: ¥9,700,000 (Direct Cost: ¥9,700,000)
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| Keywords | basicity / acidity / oxides / water / solubility / electron spectroscopy / proton / infrared spectroscopy |
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| Research Abstract |
The Solubility of water in various solid complex oxides has been examined and discussed based on the partial acid/base reactions on the local acid and base sites in the oxides. The water dissolution reaction is defined as a overall reaction of the partial acid/base reactions below:
【numerical formura】
Oxygen vacancies and normal oxide ions on the normal site in the vicinity of defects or dopant cations with the highest intensity among similar sites are defined as acid site and basic site, which are favorable sites for the reactions (1) and (2), respectively. The intensity of basicity or acidity of respective sites are defined using the electronic band structure of host oxides; acid site and base site correspond to LUMO and HOMO levels of host oxides and form acceptor and proton induced levels as results of the partial reactions (1) and (2). In order to examine the concept above, both the solubility measurements on single crystals of CeO_2 doped with various kind of trivalent lanthanide ions using Secondary Ion Mass Spectrometiy (SIMS) and Photo Electron Spectroscopy and Soft X-ray Absorption/Emission Spectroscopy measurements, to compare the relatively low solubility of water in doped ZrO_2. Also examined were both the water solubility and electron spectroscopy measurements on titanates, zirconates, and cerateswith perovskitestructuredopedwithacceptordopantstoB-site. Fromthese
experimental results, the validity of proposed partial acid/base reaction model was confirmed.
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