Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1297527 | Solid State Ionics | 2006 | 4 Pages |
Abstract
We have carried out the electrical conductivity and NMR measurements and investigated the characteristic features of the electrical conductivity in a paraelastic phase of Tl2SeO4. It was found from electrical conductivity measurement that the activation energy in the paraelastic phase (above Tc(=Â 661Â K)) is 0.98Â eV. We also found that 205Tl-NMR line width drastically decreases above Tc and becomes approximately 0.5Â Gauss. This result indicates that in the paraelastic phase the mobile Tl ions exist. Moreover this result is consistent with the existence of the anomalously large hopping motion of Tl ions observed in X-ray diffraction measurement. Furthermore the activation energy estimated from the motional narrowing of 205Tl-NMR absorption line is 0.92Â eV and is in agreement with that obtained from the conductivity measurement. From these results, it is deduced that the mobile Tl ions play an important role in the appearance of electrical conductivity in the paraelastic phase.
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Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Yasumitsu Matsuo, Yoshihide Tokoyoda, Junko Hatori, Seiichiro Ikehata,