Abstract
Using previously tested equations and constants, calculations are made of the dimensional changes to be expected in AgBr crystals as a result of the presence of varying proportions of uncharged bromine atom and silver-ion vacancy defects. The results depend to a considerable extent on the unknown degree of ordering of these defects. With reasonable assumptions as to this degree of ordering and as to the magnitudes of the other unknown and approximately known quantities involved, the experimentally observed behavior—a lattice constant decrease, followed by a return to approximately the original value on further exposure—is quantitatively accounted for.
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