Diffrenece in electrical conductivity of metal and metal oxide
Answers
Explanation:
Electrical conductivity of oxides is also markedly affected by deviations from stoichiometry. Similarly, foreign metal ions, present as impurities or doped intentionally, would also cause marked changes in the properties of metal oxides. In terms of physical properties, oxides offer most exclusive examples.
Explanation:
The ac conductivity of nickel oxide‐metal composites has been investigated as a function of the nature and concentration of the metal, the temperature, and the oxygen partial pressure. Inversion layers which form around the metal particles represent regions of n‐type conduction in the p‐type bulk. Beyond the percolation threshold for these regions, both n‐type and p‐type conduction contribute to the overall conductivity in the composite, as was found from the oxygen partial pressure dependence. Using an overlapping sphere construction for a random site percolation study, the connectivity of n‐type and p‐type regions in the composites is modeled. An estimate for an equivalent width of the space charge layer can be given, after comparison of the simulation results with the experiments. Consideration has been given to particle size distributions and possible geometrical arrangements of the dispersoids as determining parameters for the electrical properties of the composites