Specific features of static and dynamic conduction of a composite film containing metal nanogranules in dielectric matrix

Static and dynamic conduction of amorphous nanogranulated metal–dielectric composites

“…We see that, for the films from [29], the conductivity of the dielectric phase was greater by five orders and the conductivity of the metallic phase was greater by two orders of magnitude than those for the films considered in this work (10 -3 and 10 4 Ω -1 m -1 , respectively). It should also be noted that the difference between the conductivities of the metallic and dielectric phases in [29] is four orders, whereas, in our work, it is seven orders, i.e., greater by three orders of magnitude. In both cases, the metals of the primary phase, Fe and Co, are the same, whereas the metals of the dielectric phase are different: Mg, for which = Ω -1 m -1 , and Al, for which = Ω -1 m -1 [41].…”

“…OF PREVIOUS WORKS Let us compare our results with the parameters of the films studied in [29]. Those films had the compo sitions (Co 45 …”

“…The percolation corresponds to an approximate equality of the volumes of the metallic and dielectric phases and is observed at the metal con centration x ~ 0.45-0.50 [29,32]. The difference between the conductivities of the metallic and dielec tric phases, as a rule, is five-six orders of magnitude.…”

“…The first and second of these mechanisms were partly considered in [15,29]. The inter granule and inter contact capacitances were estimated, and the dominant role of contacts was revealed.…”

“…In work [29], concerned with the granulated composites, it is shown that the dynamic conductivity of such films in the microwave band can exceed by several fold the static conductivity. To explain this mechanism, the methods of shunting, effective permittivity, and intracluster currents have been proposed.…”