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Comparison in Physical Properties among AgCl, AgBr, and AgI Grains

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Physical properties have been compared among AgCl, AgBr, and AgI grains. The formation energy of interstitial silver ions through surface kink sites is in the order of AgCl, AgBr, and AgI, while the activation energy of the migration of interstitial silver ions is in the reverse order. This result is ascribed to the difference in ionic character among them, and leads to the fact that the concentration of interstitial silver ions acting as shallow electron traps is in the order of AgI, AgBr, and AgCl. This result is therefore responsible for the fact that the concentration of photoelectrons, as measured by means of a 35 GHz microwave photoconductivity apparatus, is in the order of AgCl, AgBr, and AgI. Since the solubility in water is in the order of AgCl, AgBr, and AgI, it is considered that the concentration of dissolving impurity ions acting as positive hole traps is in the order of AgCl, AgBr, and AgI, and that the silver ion concentration in the vicinity of latent image centers on the grain surface is in the same order. Although these facts make it more difficult to form latent image centers on AgI grains than on AgBr and AgCl grains in conventional photographic materials, in which the concentration of silver ions is kept low for their stability, it is indicated that AgI grains are suitable for photothermographic materials, in which AgI grains are placed in the environment with higher concentration of silver ions than in conventional ones, and are fixed during thermal development, contrary to AgBr and AgCl grains.
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Document Type: Research Article

Affiliations: Frontier Core-Technology Laboratories, Fuji Photo Film Co., Ltd., 577 Ushijima, Kaisei-machi, Ashigarakami-gun, Kanagawa-ken, 258-8577, Japan

Publication date: 2007-05-01

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  • The Journal of Imaging Science and Technology (JIST) is dedicated to the advancement of imaging science knowledge, the practical applications of such knowledge, and how imaging science relates to other fields of study. The pages of this journal are open to reports of new theoretical or experimental results, and to comprehensive reviews. Only original manuscripts that have not been previously published, nor currently submitted for publication elsewhere, should be submitted.

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