| 介电损耗法测定卤化银乳剂微晶体的离子电导 |
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| 引用本文： | 彭必先,彭彦彬,吴学汉,李振兴,刘树全.介电损耗法测定卤化银乳剂微晶体的离子电导[J].影像科学与光化学,1983,1(2):1-8. |
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| 作者姓名： | 彭必先 彭彦彬 吴学汉 李振兴 刘树全 |
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| 作者单位： | 1. 中国科学院感光化学研究所;
2. 中国科学院化学研究所 |
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| 摘 要： | 卤化银乳剂层在交变电场中显示出介电色散现象(Maxwell-Wagner效应),即在交变电场的频率f不同时,卤化银乳剂层的介电损耗ε″也不相同。根据ε″～1f,曲线可以计算卤化银微晶体的离子电导σ2。我们注意到,不同类型的明胶具有不同的介电常数ε′1,同一明胶在不同频率和真空度下所显示的ε′1也有差别。含湿量的增大使乳剂的ε″max,ε′max和ε∞的数值增大,使ε″～1gf曲线的低频端提高,使fmax向低频偏移。通过抽气严格控制样品含湿量是得到准确的σ2的关键。此外,我们还考察了乳剂层的层数和电极的尺寸对fmax和σ2值的影响。
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| 收稿时间： | 1982-02-10 |
DETERMINATION OF IONIC CONDUCTIVITY OF SILVER HALIDE EMULSION MICROCRYSTALS BY DIELECTRIC LOSS MEASUREMENTS |
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| PENg BI-XIAN,PENG YAN-BIN,WU XUB-HAN,LI ZHEN-XING,LIU SHU-QUAN.DETERMINATION OF IONIC CONDUCTIVITY OF SILVER HALIDE EMULSION MICROCRYSTALS BY DIELECTRIC LOSS MEASUREMENTS[J].Imaging Science and Photochemistry,1983,1(2):1-8. |
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| Authors: | PENg BI-XIAN PENG YAN-BIN WU XUB-HAN LI ZHEN-XING LIU SHU-QUAN |
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| Affiliation: | 1. Institute of Photographic Chemistry, Academia Siniea;
2. Institute of Chemistry, Academia Siniea |
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| Abstract: | Silver halide photographic emulsion shows a dielectric dispersion (Maxwell-Wagner effect). For a silver halide emulsion sample, there exists a maximum in the curve obtained by plotting the dielectric loss, ε″, versus frequency, f. From the curve ε″~lgf, the ionic conductivity of the silver halide microcrystals, σ2, can be deduced. The dielectric constant of gelatin, ε1’, depends on f and the nature of the gelatin, ε1’ varies also with degassing of the sample. The values of ε″max, ε’max and σε. increase with increasing moisture content of the sample. At the same time, the lower part of the curve ε″~lgf rises and fmax shifts to lower frequencies.Strict control over the moisture content of the sample by evacuation is the key point for obtaining accurate σ2. The influence of the thickness of the sample and the radius of the electrode on lgfmax is also examined. |
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