Transport, Dielectric and Switching Properties of Transition Metal Oxides.

Transport mechanisms in amorphous films of transition metal oxides and polycrystalline films of CoO, CoO(Li), Nb2O5, and TiO2 are of the Poole-Frenkel or Poole Effect type. In NiO and NiO(Li) films the transport mechanism is explained by the small-polaron conduction. Dielectric dispersion is due to the non-adiabatic hopping of charge carriers at low frequencies and adiabatic hopping at high frequencies. A novel type of switching is observed with switching, delay and recovery times of less than 3 nsec in Nb-Nb2O5-Nb with sputtered Nb counterelectrodes.