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本文研究了用不同量的I~-(1×10~(-3)-4×10~(-2)mol I~-/mol AgBr)进行表面掺杂的正八面体AgBr乳剂的介电吸收频谱,并用强X射线光源相应作了多晶X射线物相分析。当I~-的加入量小于1×10~(-2)mol/mol AgBr时,介电吸收峰随加入I~-量的增加而逐渐向高频方向位移。吸收峰弥散,分布很宽。当I~-的加入量大于1×10~(-2)mol/mol AgBr时,样品的介电吸收峰不再明显向高频方向移动,峰形亦相对比较尖锐。已有证据表明,在掺杂I~-以后,在AgBr微晶的表明层内除生成Ag(Br,I)混晶外,还附生有一薄层β-AgI.分散相颗粒表面层大约20范围内的组成与结构对非均匀电介质中的界面极化效应有重要影响,此外,对界面极化效应应用的可能性作了初步探讨。
In this paper, the dielectric absorption spectra of n-octahedral AgBr emulsions doped with different amounts of I ~ (1 × 10 -3 mol·L -1 mol / mol AgBr) , And using a strong X-ray source corresponding polycrystalline X-ray phase analysis. When I ~ - is less than 1 × 10 ~ (-2) mol / mol AgBr, the dielectric absorption peak shifts to high frequency with the increase of I ~ -. Absorption peak dispersion, distribution is very wide. When I ~ - is more than 1 × 10 ~ (-2) mol / mol AgBr, the dielectric absorption peak of the sample no longer moves to the high frequency direction sharply, and the peak shape is relatively sharp. It has been shown that a thin layer of β-AgI is present in addition to the Ag (Br, I) mixed crystals in the AgBr crystallites after doping with I. The disperse phase particles have a surface layer of about 20 The composition and structure in the range have an important influence on the interfacial polarization in the non-uniform dielectric. In addition, the possibility of the application of interfacial polarization is discussed.