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Accession number;01A1038943
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| Title;Study on the Ionic Conductivity in Superionic Conductors. |
| Author;
YONASHIRO K
(Univ. Ryukyus, Okinawa, Jpn)
IHA M
(Univ. Ryukyus, Okinawa, Jpn)
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Journal Title;Bulletin of the College of Science, University of the Ryukyus
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Journal Code:S0995A
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ISSN:0286-9640
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VOL.;NO.72;PAGE.1-20(2001)
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| Figure&Table&Reference;FIG.2, REF.70 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Superionic conductors are crystalline materials which exhibit extremely high values of ionic conductivity comparable with those of liquid electrolytes at relatively low temperatures. In order to interpret the ionic transport properties, Mahan introduced the lattice gas theory of the ionic conductivity in superionic conductors. By making use of the lattice gas model with a hopping term and Kubo's formula, we have studied the mobile ion concentration dependence of the ionic conductivity. It is intriguing theoretically and pedagogically to investigate the concentration dependence of the ionic conductivity including the formalism in the framework of the lattice gas model with a hopping term. The ionic conductivity has symmetry with respect to concentration .RHO.=1/2 and has a minimum value at .RHO.=1/2 and a maximum value at .RHO..IMAGE.0.3 and .RHO..IMAGE.0.7. The ionic conductivity first increases with the increasing mobile ions, and has the maximum and then decreases with the further increase of mobile ion concentration by increasing the repulsive interaction among the mobile ions. The maximum occurs around the actual mobile ion concentration of .ALPHA.-AgI. At 50% concentration, it is understood that the ionic conductivity has the minimum because the mobile ion and the vacancy occupy the lattice sites alternatively. (author abst.) |
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