Abstract: Cubic multistructure silver bromoiodide emulsion grains with iodide-rich layer between core and cover were studied with TEM, XRD and XPS. TEM, XRD analysis showed: the iodide-rich layers were composed of AgBr_0.83I_0.17 and AgBr_0.71I_0.29 when precipitated at pAg_5.7 and 8.7 respectively. Iodide rich layer did not cover the whole core, instead, they precipitated only near the comers of the cubic core grains. XPS analysis showed that the surface of the multistructure grain contained iodide though we added only Ag + and Br. To make the cover, the iodide concentration of the surface elevated with increased qnantity of iodide-rich phase.

Key words: silver bromoiodide, multistructure emulsion grain, iodide-rich layer