1996 Fiscal Year Final Research Report Summary
Superionic Conduction in Ionic Crystals Having the rotatory anion.
| Project/Area Number |
06640442
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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 |
固体物性Ⅰ(光物性・半導体・誘電体)
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| Research Institution | Osaka University |
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Principal Investigator |
NOBUGAI Kohji Osaka University, ISIR,Assistant, 産業科学研究所, 助手 (70156222)
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| Co-Investigator(Kenkyū-buntansha) |
MIYASATO Tatsuro Kyushu Institute of Technology, Department of Computer Science and Electronics,, 情報工学部, 教授 (90029900)
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| Project Period (FY) |
1994 – 1996
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| Keywords | Superionic Conduction Mechanism |
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| Research Abstract |
The origin of superionic conduction in crystals having the rotating anion was studies. A special excitation, libron, is formed on the anion lattice by freedom of anion rotation. On the other hand, ion relaxation mode is induced by density fluctuation of cation carriers. The superionic conduction is caused when both are coupled in one crystal.
At superionic state it was proved experimentally that the anions are oriented randomly and the libron decays after collision to cations.
Theoretical consideration was made on the mechanism of libron-relaxation mode coupling. The two mechanisms were found. One is the direct coupling which causes the long-range transport of ions, the other is indirect coupling which induces local ion relaxation. Furthermore, surf-riding coupling was found as a generalized mechanism between excitation and carriers. By this discovery the surf-riding theory of superionic conduction was completed for general system of phonon and carriers.
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