1994 Fiscal Year Final Research Report Summary
Evidence of Percolation transition in superionic conductor glasses
| Project/Area Number |
05640432
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
物性一般(含基礎論)
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| Research Institution | Hokkaido University |
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Principal Investigator |
KAWAMURA Junichi Hokkaido University, Graduate School of Science, Lecturer, 大学院理学研究所, 講師 (50142683)
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| Project Period (FY) |
1993 – 1994
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| Keywords | superionic conductor glass / percolation transition / ionic conductivity / neutron scattering |
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| Research Abstract |
Percolation theory is one of the promising candidates for explaining universal frequency response in superionic conductor glasses. However, there had been found no real glasses exhibiting a good percolation threshold from ionic conductor to insulator.
In this research project, authors found a clear evidence of percolation transition from superionic conductor to insulators in newly developed organic-inorganic mixed ionic conductor glasses such as AgI-alkylammonium iodides. At higher concentration of AgI the glasses are very good ionic conductors, however below a thresholdphi=0.35 their conductivities are below 10^<-8> S/cm and are almost insulator.
The intermediate range structure of the glasses were investigated by neutron-small angle scattering which revealed the inhomogeneous structure in nano meter scale with fractal dimension 2.8 close to the value predicted by the percolation theory.
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