Title: X-ray analysis of some mixed crystals of the silver halides
Abstract: Mixed crystals of silver chloride with silver bromide, and silver bromide with silver iodide, in various proportions of the components, were examined by the X-ray powder method of crystal structure analysis. The AgClAgar mixtures showed the simple cubic structure (NaCl type) characteristic of the pure components, with a lattice spacing lying between those of the two components and following a linear relation with the molecular concentration of each component. Most of the AgBr-AgI. mixtures showed the existence of two Table II Mol. per cent. AgCl.Mol. per cent. AgBr.Lattice spacing 100 Planes.01002.88420802.86240602.84050502.82760402.81580202.79410002.770 mixed crystals, one the simple cubic type characteristic of pure silver bromide, but with an enlarged lattice spacing, and the other the diamond cubic or hexagonal type of the silver iodide crystal, with a slightly diminished lattice constant. In mixtures up to and including 70 molecular per cent. of silver iodide, the simple cubic structure predominated, its lattice spacing increasing with the percentage of silver iodide fused in the mixture. Silver iodide appears to go into the silver bromide lattice quite readily, the calculations indicating that the largest simple cubic structure observed contained as much iodide as bromide; while judging by the effect upon the lattice constant of the silver iodide structure, very little silver bromide entered the silver iodide lattice.1 Beyond 70 molecular per cent. of silver iodide its own structure predominated in the mixture, and the lattice spacing of the simple cubic structure diminished, owing to a smaller fraction of silver iodide entering the silver bromide lattice. The prediction of Trivelli that the incorporation of silver iodide would be found to enlarge the silver bromide lattice was verified; and it seems very likely that this enlargement is connected in some way with the increased speed obtainable in photographic emulsions of silver bromide containing small percentages of silver iodide.
Publication Year: 1925
Publication Date: 1925-12-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 18
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