片状多层结构卤化银微晶的制备,结构和性能的研究Ⅱ

本文利用可控双注法制备了一系列碘含量相同、分布不同的片状多层结构Ag(Br,I)微晶,在前文的基础上,进一步研究了它们的不同结构与感光性能之间的关系。结果表明,当片状多层结构微晶中心有一个较大的AgBr层(例如该层所占银量超过总银量的10％)时,不管富碘层的位置何在,其敏度都不高于相同碘量但碘呈均匀分布的单层片状颗粒。对于同一类型结构,相同碘量的片状多层结构微晶乳剂,当微晶中心不存在AgBr层或中心AgBr层很小时,边缘AgBr层(或贫碘层)适当大,敏度较高。但微晶中心碘含量超过一定范围,不利于薄层、窄分布的片状颗粒的制备。

THE PREPARATION, STRUCTURE AND PROPERTY OF TABULAR MULTISTRUCTURE MICROCRYSTALS II

A Series of multistructure tabular iodobromide micocrystals with the same content and the different distributions of iodide ions were prepared by double-jet precipitation. The relations between structures and sensitivities of multistructure tabular microcrystals were studied,. It is disadvantageous to the improbvement of sensitivity of tabular multistructure microcrytstals, when the iodide-enriched layer is located at the edge of microcrystal. When there is a AgBr core at the center of multistructure tabular microcrystal, the sensitivity of the grains is lowered apparently with the increasing of the core area. The sensitivity of tabular grains with a larger AgBr core is always lower than that of tabular grains with the same iodide ions content but uniformly iodide distributed. When the AgBr core is very small at the center of tabular microcrystal, The sensitivity will be higher, but unfortunately, with the concentrating of iodide to the center of microcrystal, it will be more difficult to prepare tabular grains with high aspect ratio and narrow grain size distribution.