Space charge characteristics of silver halide microcrystals

摘要: A comparative study between the space charge characteristics of (100) and (111) AgX micro-crystals as a function grain size, is presented. The ionic conductivity silver halide temperature determined by dielectric loss measurements on photographic emulsions. It shown that AgCl (100), AgBr microcrystals have net negative surface which compensated positive region formed an excess interstitial ions. experimentally proved there exists essential difference cubic octahedral grains. For increase obtained but no change in activation energy for when size decreases. However, besides decrease potential, with decreasing found. Both results are explained basis previous reported model thin films. supposed to be due overlapping regions opposite planes. surfaces ascribed limitation total number available sites Frenkel defect formation. Une etude des caracteristiques de d'espace entre les microcristaux cubiques et octaedriques d'halogenure d'argent est presentee en fonction dimensions La conductivite ionique d'AgX determinee la l'aide pertes dielectriques d'emulsions photographiques. Il ete demontre que d' d'AgBr possedent une qui compensee par formee majorite d'inter-stitiels d'argent. Nous avons prouve experimentallement qu'il existe essentielle grains octaedriques. Pour d'AgCl nous constate augmentation ionique, tandis l'energie d'activation pour conduction reste constante, quand diminuent. au contraire, part d'une obtenu diminution du potentiel surface, sont diminuees. Les resultats interpretes d'un modele d'espace. il suppose l'augmentation dǔe l'interaction faces opposees. Le changement dans attribue presence nombre limite places generation defauts Frenkel.