Der Einfluß von Chlorid- und Bromidionen auf die Bildung und das Kristallwachstum von Silberjodid

Abstract

Chloride- and bromide ions were found to have a strong effect on the formation and the crystal growth of silver iodide. Suspensions of AgI with an excess of iodide were prepared in gelatin solution with and without additional chloride and bromide. The physical ripening of the silver iodide was measured by nephelometry. Under the given experimental conditions, the absence of chloride and/or bromide results in a nearly complete inhibition of crystal growth. In the presence of small concentrations of these ions during the formation the silver iodide quickly grows to form well developed crystal plates. The actual state of growth after (about) forty minutes of ripening at 77°C is shown by electron micrographs. The influence of chloride and bromide ions on silver iodide described here is of interest for controlling the precipitation phase of high-speed silverbromideiodide in photographic emulsions.