Abstract
The photographic emulsion consists of the conductive silver halides and the insulating gelatin, and such a heterogeneous medium shows the dielectric dispersion, called Maxwell-Wagner effect. From the dielectric measurement, the ionic conductivity of small silver bromide crystals is measured for both pure and cadmium containing emulsions. The ionic conductivity of the pure silver bromide grains is 1.0×10-6 Ω-1 cm-1 with an activation energy of 0.42 eV and the conductivity is proportional to the surface-volume ratio of the grains. The origin of the high conductivity here seems due to the nature of the surface. The conductivity decreases as the cadmium concentration is increased and by adding 0.08 mol of cadmium per mol silver bromide, it decreases by the factor of about 10-2 with an activation energy of 0.78 eV.
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