【摘要】 应用自动控制pAg的双注仪制备了一个系列的溴碘化银核壳复合结构的乳剂。用STEM-EDS研究了碘的含量及其加入方式对于卤化银扎剂微晶体的几何性质(颗粒大小、形状)及其碘在微晶体中的分布的影响。结果表明:碘化钾加入的时间越早,加入的浓度越大,则碘离子越富集于微晶体的核心。微晶体中确实存在着富碘相与贫碘相的复合结构。随碘含量的增加,颗粒尺寸减小,颗粒的晶形由规整的八面体向圆角八面体过渡,而碘的分布也由体相核心向边缘表面不断扩散,从而使核壳型的富碘相和贫碘相复合结构的界面趋向模糊。更多还原

【Abstract】 Three series of bromoiodide emulsion microcrystals with composite structure were prepared by double-jet method with automatic control pAg. The geometric properties, such as grain size, crystal habit, and the iodide distribution in the bulk and surface of microcrystal were determined as a function of iodide content, iodide introduction time and amount during the precipitation by STEM-EDS method. It was shown that the earlier the iodide was introduced and the more the iodide was incorporated, the more the iodide was enriched into the core of the microcrystals. In the microcrystals really exists the composite structure of iodide-rich and iodide-poor phases. With the iodide increase the grain size decreased, the crystal habit was transformed from regular octahedral to rounded octahedral, the iodide distribution was diffused step by step from the bulk to the surface, obscuring the boundary of composite structure of iodide-rich and iodide-poor phases.更多还原