Electronic Conduction in Bisngbnd;BiI3Melts. A Theoretical Model

摘要

Experimental electrical conductivity data for the liquid Bisngbnd;BiI3system are analyzed in terms of predominant conduction in the salthyphen;rich region by an electronic ``jumping'' or exchange process between the monohyphen; and tervalent states of bismuth. Calculations of the jump frequency from the conductivity data show the expected dependence on temperature and average distance between exchange sites. Results of the calculations are used to evaluate the average energy barrier height for the exchange process and the enthalpy of symmetrization of the ionic atmospheres about the exchange sites, as required by the Franckhyphen;Condon principle. The latter is found to be independent of the average distance between exchange sites.