2006 Fiscal Year Final Research Report Summary
Synthesis and ionic conductivity of high-charge-density mica ceramics
| Project/Area Number |
17550176
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic industrial materials
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| Research Institution | SHINSHU UNIVERSITY |
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Principal Investigator |
TATUTA Seiichi SHINSHU UNIVERSITY, Faculty of Engineering, Department of Chemistry and Materials Engineering, Professor, 工学部, 教授 (00217209)
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| Co-Investigator(Kenkyū-buntansha) |
KITAJIMA Kunio SHINSHU UNIVERSITY, Faculty of Engineering, Department of Chemistry and Materials Engineering, Professor, 工学部, 教授 (30021009)
YAMAGUCHI Tomohiro SHINSHU UNIVERSITY, Faculty of Engineering, Department of Chemistry and Materials Engineering, Assistant Professor, 工学部, 助教 (30283237)
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| Project Period (FY) |
2005 – 2006
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| Keywords | mica / ceramics / layered compound / ion exchange / proton / lithium ion / ionic conductivity |
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| Research Abstract |
We found novel and simple synthetic method of high-charge-density sodium mica (Na-4-mica) which is distinguished from ordinary Na type micas by a layer charge per formula unit of approximately-2.0. The Na-4-mica and ordinary Na type mica was showed the conductivity of 3.4×10^<-4> S/cm and 1.2×10^<-6> S/cm at 650℃, respectively, which indicates that the high-charge-density micas have higher conductivity than ordinary charge-density micas. Firstly, Na^+ ion in Na-4-macas was ion exchanged by LiCl solution. The interlayer ion of obtained ion exchanger was hydrated Li^+ ion. As the hydrated Li^+ ion was dehydrated by heating, the conductivity was increased and showed the conductivity of 3.2×10^<-4> S/cm at 650℃. Secondly, Na^+ ion in Na-4-macas was exchanged by NH_3^+ ion. The ion exchanger heated at 600℃ had the conductivity of 1.3×10^<-6> S/cm at 650℃. This conductivity did not cause by migration of NH_3^+ ion but resulted from migration of H^+ ion liberated from NH_3^+ ion. The ion exchanger heated at 1000℃ had the structure of trisilicic type mica of which interlayer ion was proton, and showed the conductivity of 7.9×10^<-8> S/cm at 650℃. Thirdly, Na^+ ion in Na-4-macas was ion exchanged by acetic acid solution. The interlayer ion of ion exchanger was oxonium ion. The ion exchanger heated at 600-1000ーC had the same structure with NH_3^+ ion exchanger heated at 1000℃ and they showed the same conductivity.
We tried the fabrication of glass-ceramic separated high-charge-density calcium mica. The interlayer of the mica contains a large amount of Ca^<2+> ion which is almost the same size with Na^+ ion. By substituting the B_2O_3 for parts of Al_2O_3 in the high-charge-density calcium mica, we succeed the fabrication of the glass-ceramics. It showed the conductivity of 2.2×10^<-6>/cm at 650℃.
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