LOW-FREQUENCY DIELECTRIC-RELAXATION FROM COMPLEX IMPEDANCE AND COMPLEX ELECTRIC MODULUS

The low frequency dielectric characteristics of many materials are often difficult to obtain accurately because of the d.c. conductivity contribution, which is the major portion of the loss, and which has to be subtracted from the total dielectric loss. This is particularly true for small dielectric relaxation peaks which tend to be overwhelmed by the d.c. conduction loss. An equation was derived which enables one to calculate the dielectric characteristics at low frequency, for specimens with small dielectric relaxation peaks, without subtracting the d.c. conductivity, from the complex impedance plot and complex electric modulus" plot. © 1979 Chapman and Hall Ltd."