| Autor: |
Nair, Sreejith M., Yahya, A.I., Ahmad, Afaq |
| Zdroj: |
Journal of Solid State Chemistry; March 1996, Vol. 122 Issue: 2 p349-352, 4p |
| Abstrakt: |
Ion conductivities of face centered cubic Ag2HgI4–Cu2HgI4systems doped with Cd2+, K+, and Na+were measured. In 67 mol% Ag2HgI4solid solution doped with Cd2+ions, the phase transition occurs at a lower temperature than in the parent compounds and the system shows higher conductivity. The increase in conductivity is discussed in terms of vacancies produced. K+doped Ag2HgI4exhibits higher conductivity prior to the phase transition, which is attributed to lattice loosening. A decrease in conductivity is observed above 140°C. This is interpreted in terms of anion framework collapse. Na+doped Ag2HgI4shows high conductivity for the high temperature phase because of the small size of Na+ions. The activation energy for ionic motion for all the samples is calculated from the graph of log(σT) versus 1/T. |
| Databáze: |
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| Externí odkaz: |
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