Degenerated mixed cation effect in CuIâAgIâAs2Se3 glasses: 64Cu and 110Ag tracer diffusion studies
| Autor: | Michel Ribes, Annie Pradel, E.A. Bychkov, Yu Gavrilov, Yu. S. Grushko, A. Bolotov, V. Tsegelnik, Yu. G. Vlasov |
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| Rok vydání: | 1998 |
| Předmět: |
Annealing (metallurgy)
Inorganic chemistry Silver iodide Analytical chemistry chemistry.chemical_element General Chemistry Conductivity Condensed Matter Physics Thermal diffusivity Copper Ion chemistry.chemical_compound chemistry Electrical resistivity and conductivity Ionic conductivity General Materials Science |
| Zdroj: | Solid State Ionics. :697-701 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/s0167-2738(98)00397-x |
| Popis: | In contrast to the usual behaviour of mixed cation glasses (large deviations from additivity with a pronounced minimum at the conductivity isotherms and a diffusivity crossover when guest cations reduce the mobility of ions coming from the host material), the CuI-AgI-As 2 Se 3 glassy system exhibits remarkable differences in the transport properties. First, the ionic conductivity increases monotonically by four orders of magnitude from 3 x 10 -8 to 5 X 10 -4 S cm - when CuI is gradually replaced by AgI, without any minimum at intermediate concentrations. Secondly, no diffusivity crossover was observed. The 110 Ag tracer diffusion coefficient D Ag follows the conductivity isotherm with nearly the same changes in D Ag of four orders of magnitude, from 10 - 12 cm 2 s -& to 10 8 cm2 s 1 . The 64 Cu tracer diffusion coefficient D Cu increases by a factor of 20 to 30 when copper is substituted by silver. Moreover, the values of D Cu are always lower than D Ag . The only exception is a 0.5CuI. 0.5As 2 Se 3 glass, for which D Ag and D Cu are very similar. The results obtained can be described as a degenerated mixed cation effect with different trends for silver and copper mobile cations. |
| Databáze: | OpenAIRE |
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