Evidence for and against the paddle-wheel mechanism of ion transport in superionic sulphate phases

High-temperature phases of Li 2SO 4, LiNaSO 4, LiAgSO 4 and Li 4Zn(SO 4) 3 differ from other high-temperature phases concerning cation diffusion, transition enthalpies, neutron diffraction patterns, light scattering, etc. It has been concluded that the cation mobility is much enhanced by the strongl...

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Bibliographic Details
Published in:Solid state communications 1988-03, Vol.65 (10), p.1237-1240
Main Author: LUNDEN, A
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Diffusion in solids
Exact sciences and technology
Physics
Self-diffusion and ionic conduction in nonmetals
Transport properties of condensed matter (nonelectronic)
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Summary:High-temperature phases of Li 2SO 4, LiNaSO 4, LiAgSO 4 and Li 4Zn(SO 4) 3 differ from other high-temperature phases concerning cation diffusion, transition enthalpies, neutron diffraction patterns, light scattering, etc. It has been concluded that the cation mobility is much enhanced by the strongly coupled rotational motion of the translationally static sulphate ions. This phenomenon has been coined the paddle-wheel or cogwheel mechanism. It validity has been questioned on the basis of some conductivity measurements. However, the results of these experiments show pronounced differences from other conductivity studies concerning magnitude, activation energy and frequency dependence. The cause of these deviations is likely to be the choice of a questionable experimental technique.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(88)90930-1