THE ELECTRICAL RESPONSE OF RBAG4I5 GRAPHITE INHOMOGENEOUS INTERFACES

The ac impedance of the cell graphite/graphite plus RbAg//4I//5/RbAg//4I//5/graphite plus RbAg//4I//5/graphite was investigated in the frequency range from 10** minus **4 to 3 multiplied by 10**5 Hz. A model assuming the graphite plus RbAg//4I//5 mixture to represent a porous interface could explain the observed dependences in nearly the whole frequency range with the exception of the lowest frequencies. Attempts to improve the agreement presuming adsorption, discharge of charge carriers or diffusion of neutral species failed. An excellent fit could be achieved assuming a frequency dependent ac conductivity of the interface, approximately proportional to the frequency, as in the bulk of many solids with low conductivity, such as amorphous semiconductors or dielectrics.