【摘要】 利用Maxwell-Wagner效应,采用介电损耗测定法,在10kHz—3MHz的频率范围内,研究了苯亚磺酸钠(sodium benzosulfinate,简称BSI),1-苯基-5-巯基四氮唑(1-phenyl-5-mercaptotrazole,简称PMT)和5-甲基-7-羟基-1,3,4-三氮吲(口乃木)利嗪(5-methyl-7-hydroxyl-1,3,4-triazaindolizine,简称TAI)对卤化银乳剂微晶体的离子电导率的影响。加入BSI(4.76—19.07g/M AgBr)并不引起离子电导率的降低,而加入PMT和TAI(只是0.93g/M AgBr)却使离子电导率降低2个对数单位,升高了卤化银乳剂微晶体的离子电导活化能△E和表面电位eφ_s(约升高0.12eV)。进一步的研究表明:在乳剂微晶体中所含的碘,对于TAI吸附在微晶体上所引起的离子电导率的降低具有很强的抑制作用。文中对稳定剂对于离子电导性质影响的根据进行了讨论。更多还原

【Abstract】 The influences of sodium benzosulfinate(BSI), 1-phenyl-5-mercaptotetrazole (PMT) and 5-methyl-7-hydroxy-1, 3, 4-triazaindolizine (TAI) on the ionic conductivity of the microcrystals of silver halide emulsion are investigated by Maxwell-Wagner effect with the aid of dielectric loss measurement in the frequency range of 10 kHz-3 MHz.The addition of BSI (4.76-19.07 g/M AgBr) causes no drop of the ionic conductivity, whereas the addition of PMT and TAI (0.93 g/M AgBr) decreases the ionic conductivity greatly by about 2 log units and increases the conduction activation energy and surface potential by 0.12 eV. It is further shown that the iodide contained in emulsion microcrystals has a great restraining effect on the ionic conductivity decrease when TAI is adsorbed onto the microcrystals. This finding is of significance from the practical aspect.The possible explanation of the above-mentioned phenomena in ionic condutivity behaviour is presented and discussed.更多还原