Characterization and electrical properties of p-methyl phenyl azo ethyl aceto acetate metal chelates

Abstract

The temperature dependence of the d.c. conductivity, dielectric constant and thermally stimulated depolarization current (TSDC) have been investigated for press-prepared metal-ligand complex samples. The electrical conductivity results are explained by assuming that both ionic and electronic conduction mechanism coexist with different contributions over the whole temperature range of experiments. The dielectric constant ɛ′ shows a sharp peak at a particular transition temperature in all samples. The effect of annealing on dielectric constant of nickel complex sample induces a remarkable reduction in its magnitude. The TSDC spectra have been found to be characterized by two pronounced peaks in cobalt complex and a broad peak for the other complexes. For aged cobalt complex sample, one sees clearly that the longer the ageing time, the smaller the polarization.