High Frequency Conductivity of NiO

概要

論文の詳細を見る
The conductivities of 1.2, 7.9 and 12.6 ppm (weight ratio) Li-substituted NiO are measured at high frequencies up to 24 GHz in the temperature range 110° to 450°K. The conductivity at high frequencies can be expressed as the sum of a temperature-dependent conductivity $\sigma_{1}$ and a temperature-independent additive conductivity $\sigma_{2}$. The former $\sigma_{1}$ is independent of frequency until microwave region but the latter $\sigma_{2}$ is strongly dependent on freqnency. The frequency dependence of $\sigma_{2}$ can be represented by the dispersion formula for the dielectric loss due to the hopping of charge carriers around imperfections. The staying time at a lattice site is determined: $\tau{=}2.2\times 10^{-10}$ sec. A lack of temperature dependence of $\sigma_{2}$ implies that the staying time $\tau$ does not depend on temperature and further that the holes are not selftrapped. The conduction mechanism in NiO is rather illustrated as something analogous to impurity conduction.
Physical Society of Japanの論文
1968-03-05