Chapter

Structure and Preparation of Silver Halide Grains

Tadaaki Tani

in Photographic Science

Published in print August 2011 | ISBN: 9780199572953
Published online January 2012 | e-ISBN: 9780191731266 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199572953.003.0002
Structure and Preparation of Silver Halide Grains

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The structure and preparation of AgX grains with desired size, halide description, and shape (typically cubic, octahedral, or tabular) for photographic materials are described in detail. They are face-centred cubic in crystal structure, and have {100} and/or {111} faces on the surface. Their shape is controlled by the adjustment of silver ion concentration during grain growth. The size distribution can be narrowed to form mono-dispersed grains by making the rate of grain growth diffusion-controlled. Twinned tabular grains, which are particularly important for color films, are composed of more than two twin planes in parallel with their main surfaces composed of {111} plains. While the formation of twinned planes is by chance and enhanced by supersaturation, selective formation of tabular grains could be achieved due to rapid lateral growth under Ostwald ripening conditions.

Keywords: silver halide grains; cubic grains; octahedral grains; tabular grains; twin planes; mono-dispersed grains; stirrer

Chapter.  12766 words.  Illustrated.

Subjects: Atomic, Molecular, and Optical Physics

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