C4 - Prof. Dr. M. D. Ingram
Ion transport and matrix-mediated coupling processes in mixed-alkali glasses
Initially, the main thrust of project C4 was to identify the rôle of ion-matrix interactions and the way they impact on the mixed alkali effect in glass. The project is
now much broader in scope and embraces all aspects of variable-pressure, variable-temperature measurements - including the interpretation of activation energy and
activation volume data for glasses, polymer electrolytes and for similar 'fragile' liquids. The
main achievements, so far, include:
- The development of a systematic approach
for interpreting activation volume data in disordered ionic conductors, both as liquids and as glasses;
- Using activation volume data to distinguish clearly the differing behaviours of single- and mixed-cation glasses;
- A proposed three-step
transport mechanism, which accounts qualitatively for the observed differences between single- and mixed-cation glasses, not only in regard to the new data on activation
volumes, but also for very recent results from positron annihilation lifetime spectroscopy (PALS);
- A new approach to free volume concepts and related issues surrounding the temperature dependence of ion mobilities in polymer electrolytes.
Within
this expanding project, the leitmotiv throughout has remained the search for microscopic descriptions in terms of ion-matrix interactions.
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