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多碘离子
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The influence of pAg on the grain size, aspect ratio, distribution of iodide inos and ionic conductivity of tabular silver halide crystals during precipitation is studied. With the increase of pAg value during precipitation, the grain size and aspect ratio of tabular silver halide crystals are all increased and more and more iodide ions transfer from the center to the surface of grains. The surface halogen atomic ratio, I:(Br+I), is determined by X-ray photoelectron spectroscopy. The transfer of iodide ions...

The influence of pAg on the grain size, aspect ratio, distribution of iodide inos and ionic conductivity of tabular silver halide crystals during precipitation is studied. With the increase of pAg value during precipitation, the grain size and aspect ratio of tabular silver halide crystals are all increased and more and more iodide ions transfer from the center to the surface of grains. The surface halogen atomic ratio, I:(Br+I), is determined by X-ray photoelectron spectroscopy. The transfer of iodide ions shows that a recrystallization process occurred in the present double-jet precipitation. The dielectric loss of tabular silver halide emulsions with various pAg values during precipitation is examined. The results indicate that the log fmax peaks are shifted toward low frequency with the increase of the surface content of iodide ions and the grain size. But according to our previous paper the log fmax peaks are shifted to high frequency with the increase of total iodide content of tabular silver halide emulsions. The effect of the surface iodide content of the emulsions on the ionic conductivity of the emulsions is not obvious, because the total iodide content of the emulsions is kept constant. The decrease of log fmax peaks is due to the increase of grain size of the emulsions with pAg values during precipitation.

本文研究了双注法制备片状卤化银微晶时,pAg值对所形成的卤化银片状颗粒的尺寸、纵横此、碘离子分布以及离子电导率的影响。随着pAg值的升高,片状颗粒的尺寸和纵横比都相应地增大和升高,且越来越多的碘离子从颗粒中心向外层迁移,直至到达表层,这说明存在晶体的重结晶过程。表面层的溴碘原子比是用X射线光电子能谱仪(XPS)测定的,并测量了不同pAg值下制备的不同尺寸的片状卤化银乳剂的介电损耗频谱。其结果表明,片状颗粒的尺寸影响其离子电导率,表层碘含量的影响不明显。

 
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