| Attributs | Valeurs |
|---|
| type
| |
| Is Part Of
| |
| Subject
| |
| Title
| - Rubidium Impurity Diffusion in a Poly(ethylene oxide)−Sodium Iodide Polymer Electrolyte
|
| has manifestation of work
| |
| related by
| |
| Author
| |
| Abstract
| - Diffusion of the radioisotope 86Rb in an amorphous polymer−salt complex consisting of poly(ethylene oxide)and sodium iodide was found to be faster at all temperatures investigated than tracer self-diffusion of thesmaller alkali metal cation 22Na. This is the striking result of the first study on impurity diffusion in a polymerelectrolyte system and a comparison with ionic self-diffusion and conductivity data previously obtained fromthe same system. The experimental findings can be rationalized within an ion transport model based on theoccurrence of charged single ions and neutral ion pairs. Simultaneous analysis of all data revealed that thediffusivity of Rb+ is likely to be lower than that of Na+. Similarly, the diffusivity of RbI0 pairs was found tobe smaller than that of NaI0 pairs. Surprisingly, the faster overall transport of Rb as measured by radiotracerdiffusion appears to be due to a relatively large fraction of RbI pairs, in conjunction with the finding that theion pair diffusivities exceed the single cation diffusivities by 2 orders of magnitude.
|
| article type
| |
| is part of this journal
| |
