Electrical conductivity in two phase nickel–nickel oxide mixtures and conductivity of nickel oxide at the nickel–nickel oxide phase boundary

Abstract

The electrical conductivity of sintered pellets of nickel–nickel oxide mixtures of various compositions has been measured as a function of temperature in the range 700–1000 °C. The electrical conductivity of nickel oxide single crystals in air as well as in oxygen pressures corresponding to nickel–nickel oxide equilibrium has also been determined as a function of temperature. The conductivity of nickel–nickel oxide composites decreases initially, attains a minimum at approximately 1 mol % nickel and increases again with the increase in concentration of nickel. The activation energy for conduction remains constant for all compositions containing 20 mol % or less nickel. The variation of conductivity with compositions containing 1–20 mol % nickel is found to be in accordance with Wagner’s model. The decrease in conductivity of nickel oxide with the addition of 1 mol % nickel has been attributed to the trapping of holes from nickel oxide by electrons from the dispersed nickel.

Tuning of Conductivity and Density of States of NiO Mesoporous Films Used in p-Type DSSCs

“…The purpose of the variation in LiClO 4 concentration is to analyze the effect of the Li + on the surface. It was proposed in the literature , that the conduction of NiO mesoporous film occurs via two channels: one on the surface of the particle and the other through the particle. It is reasonable to think that both of the conduction mechanisms are affected by the Li concentration.…”

Electrical properties of YSZ/NiO composites prepared by a liquid mixture technique

“…An example is the decrease of the electrical conductivity (σ) by the addition of Ni in the NiO matrix. 3 Some models like percolation, effective media, and space-charge layers have been applied to account for the observed electrical behavior of composites. 2,4 Moreover, the nature of the charge carriers and the dependence of σ on the microstructure, temperature, and oxygen partial pressure can be considered as important parameters for electrochemical applications.…”

Optical properties of metallic nanowires by valence electron energy loss spectroscopy

“…These conductivities have been linearly extrapolated from 1 eV to 0 and conductivities of 18.10 6 S/m and 9.10 6 S/m for Ni and NiO have been obtained. The important conductivity of NiO compared with Ni can be explained by the presence of Ni in the oxide nickel layer due to the analysis [21]. These intrinsic conductivity values are essential to determine the kind of charge transport inside the polymer.…”