作　　者： ; ;

机构地区： 中山大学物理科学与工程技术学院物理系

出　　处： 《物理学报》 1997年第1期155-161,共7页

摘　　要： 用微分时域谱方法，研究了苯和正烷烃中空间电荷的存在和运动规律．理论分析表明，高绝缘体中空间电荷位移的等效扩散运动导致慢极化效应；其响应时间与电极距离的平方成比例，实验证实了理论结果．在苯和正烷烃中都观察到一个快极化和两个慢极化分量．其强度和响应时间随温度的变化给出分子运动与链长关系的信息． Abstract The diffusion theory shows that the displacement of space charges leads to a slow polarization effect;the response time is proportional to the square of the distance between the electrodes.The theoretical results are confirmed in experiments.A method of differential time domain spectroscopy is used to study the existence and movement of space charges in C 6H 6 and CH 3 (CH 2) n CH 3.There are one fast component and two slow components in these compounds.Their response times and strength give information about the molecular length and motion at various temperatures.This differential dielectric spectroscopy in the time domain is a very sensitive method for trace analysis of inpurities in highly insulating liquids.

关 键 词： 扩散 介电谱 绝缘液体 空间电荷

领　　域： [电气工程] [一般工业技术]