CHARACTERIZATION AND ELECTRICAL-PROPERTIES OF P-METHYL PHENYL AZO ETHYL ACETO ACETATE METAL-CHELATES

The temperature dependence of the d.c. conductivity, dielectric consta nt and thermally stimulated depolarization current (TSDC) have been in vestigated for press-prepared metal-ligand complex samples. The electr ical conductivity results are explained by assuming that both ionic an d electronic conduction mechanism coexist with different contributions over the whole temperature range of experiments. The dielectric const ant epsilon' shows a sharp peak at a particular transition temperature in all samples. The effect of annealing on dielectric constant of nic kel complex sample induces a remarkable reduction in its magnitude. Th e TSDC spectra have been found to be characterized by two pronounced p eaks in cobalt complex and a broad peak for the other complexes. For a ged cobalt complex sample, one sees clearly that the longer the ageing time, the smaller the polarization.