Dielectric Behaviour of some binary liquid mixtures at Microwave Frequencies

Abstract

Dielectrics are the materials in which electric field can set up for a long time. newlineDielectric is an insulating material in which all the electrons are tightly bound to the newlinenuclei of atoms and there are no free electrons available for the conduction of current. newlineTherefore, the electrical conductivity of a dielectric is very low. The conductivity of an newlineideal dielectric is zero. newlineTherefore, dielectric materials sharply differ in their basic electrical properties newlinefrom conducting materials when they are placed in an electric field, they modify the newlineelectric field and they themselves undergo appreciable changes because of which they act newlineas stores of electrical charges when charge storage is the main function the materials are newlinecalled dielectrics. The electric material has the ability to store electric charges. Properties newlineof dielectric materials are of interest to scientists in various branches: Physicists, newlinechemists, electrical engineers, electronic engineers, and biologists. newlineTheir interest concern different aspects, thus an electrical engineer will require the newlinedependence of dielectric loss on frequency as well as temperature in order to find a newlinesubstance which is nearly loss free in certain range. The chemists on the other hand can newlineuse this knowledge to draw conclusions on the properties of molecules. newlineThe most of the important measurements on dielectrics have been carried out on newlinesolids and liquids in spite of four generic mediums like, solids, liquids, gases and newlinevacuum. A dielectric measurement in a vacuum is impractical. Dielectric investigation of newlinebinary mixture containing varying amounts of interacting molecules helps to detect the newlineformation and composition of complex in them. newlineKnowledge of frequency dependent dielectric properties of binary liquid mixture newlineis important together in fundamental studies of solvent structure determination, its newlinedynamics and in the practical applications. At fundamental stage, the frequency newlinedependent dielectric behavior of liquid mixtures gives information on molecular newlineinteractions as w