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Proceedings Paper

Ionic conductivity research of the photoemulsion silver halide microcrystals by dielectric losses method
Author(s): I. A. Sergeeva; P. S. Bondarenko; E. V. Shaposhnikova; N. S. Zvidentsova
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Paper Abstract

The method of dielectric losses offered van Biezen in an extremity 60-th [ 1], is widely used for a research of the ionic conductivity of the photoemulsion silver halide microcrystals (MC). According to the method, photoemulsion represents the heterogeneous system consisting of conducting silver halide grains, concluded to the insulating gelatine. With overlay of an external electrical field in a such system there is a dielectric dispersion. Complex dielectric permittivity s + i ", where c ' - usual dielectric permittivity, " tgö- the factor of dielectric losses. Frequent dependence of the dielectric losses factors defined by expression [2J: 8" (co) = (g - S) (1 + (cot) asin inx/2) I (1 + 2 (cot) cositoc/2 + (r) 2a) has a maxima under condition of cot 1 , where (s - )- residual between values of static and optical dielectric permittivity 0) - cyclic frequency of an external electrical field; the parameter 0 < oc < 1 , determines a scatter on times of relaxation; 't time of relaxation. The frequency of a maxima of dielectric losses (Fmax) is directly proportional of ionic conductivity ( r) silver halide MC: =Fmax(-E ) 2/q(8c-Eo) Where 81 - dielectric permittivity of gelatine, q- a volumetric long of silver halide. The researches which have been carried out per the last years, have shown, that the ionic conductivity of silver halide MC depends on a number of the factors, such as habit and size of microcrystals, pAg of a solution of synthesis, addition of photogfraphic active substances. From here explicitly follows, that the change of a state of the microcrystal's surface, owing to various conditions of synthesis and adsorption of active substances influences the photographic characteristics emulsion, and also changes of the interstitial silver ions concentration -main carriers of a charge in the silver halide, which, as is known, plays the important role in the generation of the latent image centers.

Paper Details

Date Published: 1 January 1998
PDF: 5 pages
Proc. SPIE 3347, Optical Information Science and Technology (OIST97): Optical Recording Mechanisms and Media, (1 January 1998); doi: 10.1117/12.301441
Show Author Affiliations
I. A. Sergeeva, Kemerovo State Univ. (Russia)
P. S. Bondarenko, Kemerovo State Univ. (Russia)
E. V. Shaposhnikova, Kemerovo State Univ. (Russia)
N. S. Zvidentsova, Kemerovo State Univ. (Russia)


Published in SPIE Proceedings Vol. 3347:
Optical Information Science and Technology (OIST97): Optical Recording Mechanisms and Media
Andrei L. Mikaelian, Editor(s)

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