Electrical Conductivity of Films with Negative Dielectric Permittivity

Resumo

The electrical conductivity of films from spherical nanoparticles of metal oxides Al₂O₃ and NiO, whose surface is saturated with hydrogen atoms, is studied. It is found that under the action of an electric field the films pass into a stable state of polarization. In this unchanged state at a current J ≥ 0, the differential electrical resistance of the films is zero. It is established that the static dielectric constant \(\varepsilon (0,\bar {k})\) of finely dispersed dielectrics Al₂O₃, NiO, and KMnO₄ saturated with hydrogen has a negative value. At the same time, regardless of temperature (T = 295–500 K), in the case of a constant or sinusoidal current, the ohmic resistance of a powder is zero if it simultaneously satisfies the condition ε(0, \(\bar {k}\)) < 0. This effect is a consequence of the negative value of the free energy of a polarized powder.