Site-transfer electronic conductivity. The hopping or polaron (direct-current) mechanism from dielectric relaxation studies on intervalence mixtures and charge-transfer adducts
- 1 January 1981
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 77 (7) , 1719-1727
- https://doi.org/10.1039/f19817701719
Abstract
A basically phenomenologicalk relationship between the direct-current (d.c.) conductivity and the characteristic dielectric relaxation frequency is derived for solids in which site-to-site transfer of electrons is the mechanism for both the conductivity and the dielectric polarisation. It is shown to hold approximately for the mixed-valence salt K3(MnO4)2(for which the experimental data are reported), and also for the perylene-chloranil adduct, for complexes of proteins with methylglyoxal and for further biological molecules. The relevance to charge-transfer spectra is indicated. The d.c. conductivities of KMnO4+ K2MnO4 mixtures are reported, confirming the intervalence site-transfer mechanism to be dominant in K3(MnO4)2.Keywords
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