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Conductivity and static permittivity of ceramic materials containing nanoparticles of Ni were measured in the vicinity of percolation threshold. It is found that, below this threshold, the experimentally obtained dependences of conductivity and static permittivity on the fractional Ni content in these materials are different from those calculated in the frame of the percolation theory. The origin of this discrepancy is discussed in terms of the network hierarchy model proposed recently by Balberg et al. for composite materials.

Copper-containing nanoparticles in a high-pressure polyethylene matrix were prepared by thermal decomposition of copper acetate. An electron microscopic study of the morphology and an X-ray diffraction analysis of the phase composition of a nanocomposite were carried out. It was shown that the dispersed phase essentially consisted of metallic copper nanoparticles with a size of 33.94 nm.

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