Abstract
AbstractThe involvement of dislocations and donor centres in the technology of high- performance, negative surface-imaging emulsions with monodisperse, regular hexagonal, thin tabular grains is discussed. In core/shell and core/annularzone/shell structures, narrow prismatic edge dislocation half-loops, extending through the annular zone and outer shell from the interfaces to the lateral edges, are introduced to partially relax lattice strains resulting from halide ion concentration gradients. The sites of termination of these dislocations provide local areas of enhanced surface reactivity or dislocation sensitivity centres. Sensitizing Ag2,Ag20 and Ag2S donor centres are introduced within the grains and on the outer surface. Sensitizing (Ag,Au)S donor centres are confined to the outer surface and preferentially formed at the sensitivity centres where they are associated with Ag2 donor molecules also functioning as latent image growth nucleus precursors. The formation of such Ag2 molecules along internal d...
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