| Project/Area Number |
07555197
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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 | 展開研究 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Tokyo Gakugei University (1996-1997)
Tottori University (1995) |
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Principal Investigator |
KAMATA Masahiro Tokyo Gakugei University, Faculty of Education, Associate Professor, 教育学部, 助教授 (20204604)
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| Co-Investigator(Kenkyū-buntansha) |
KOIDE Kunihiro TYK Corporation, Research and Development Center, Manager, 研究所, 主任研究員
YONEDA Kenji Kyoto University, Research Reactor Institute, Resaearch Associate, 原子炉実験所, 助手 (10027443)
FUJINE Shigenori Kyoto University, Research Reactor Institute, Resaearch Associate, 原子炉実験所, 助手 (90027441)
KANDA Keiji Kyoto University, Research Reactor Institute, Professor, 原子炉実験所, 教授 (10027419)
ESAKA Takao Tottori University, Faculty of Engineering, Professor, 工学部, 教授 (70116317)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1997: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1996: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1995: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | neutron radiography / cold neutron radiography / lithium ion couductor / solid electrolyte / ceramic / イオン輸率 |
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| Research Abstract |
(1) An electric heater using IR beam was installed in the NR facility of Kyoto University Reactor for in-situ measurements of Li^+ movement in solid electrolytes under high temperature. The performance of the heater and its influence to the facility were experimentally evaluated using some simulated samples(ceramic materials wet with water).
(2) Neutron radiography was used to study the transfer of lithium ions in the high temperature-type ionic conductor, Li_<1.33>Ti_<1.67>O_4. After dc current was passed for electrolysis through specially prepared xides with different isotope ratios(^6Li/^7Li), a set of NR images was obtained, which confirmed the lithium ion conduction in the oxides. Analysis of the imagesclarified that the lithium ion transport number of the oxide is almost equal to 1.0 and that lithium ions in the Li_<1.33>Ti_<1.67>O_4 were transferred almost reversibly according to the polarity of the electric field applied.
(3) Cold neutron radiography was applied to study the lithium ion conduction in the substituted scheelite-type oxide of Ca_<0.95>Li_<0.10>WO_4. The lithium ion distribution profile were obtained from a set of neutron radiography images of the electrolyzed oxides having different ^6Li/^7Li ratios. They showed that the lithium ion transport number of the oxide is 0.99, which coincided with the result of electrochemical measurements. Furthermore, they denoted that only a half of all lithium ions in Ca_<0.95>Li_<0.10>WO_4 can move with charge transfer, but another half stays at the calcium sites. Therefore, it can be considered that the lithium ion conduction would be due to the 50% of the interstitial lithium ions.
(4) It was confirmed that the combination of cold neutron radiography and an imaging plate was effective to improve the accuracy of the technique to measure Li^+ in the oxides.
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