電子伝導性酸化物ガラスの直流分極と誘電緩和

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Dielectric properties of electronic conduction oxide glasses containing Fe2O3 or WO3 were studied by the D. C. and A. C. measurments (10-1-10-6c/s) in the temperature range from 0° to 200°C. Though the conduction of these glasses is electronic, the time dependence of currents is found for the glasses at lower temperatures. The time dependent currents show Ohmic characteristics, and both charging and discharging currents decrease with time and the decay characteristics of the currents are identical. The dielectric absorption curve calculated from the time dependent current by Hamons equation is smoothly linked with that obtained by A. C. measurment in higher frequency range. These facts suggest that the origin of this time dependent current should not be attributed to the space charge polarization but be attributed to the dielectric relaxation measured as a dielectric dispersion (or absorption) in higher ranges of temperature and frequency.The activation energy for dielectric relaxation is nearly identical with that for D. C. conduction. And there is a correlation between the D. C. conduction and the dielectric dispersion (or absorption) as follows;σ_??_ε0⋅Δε⋅2πfmax.where σ is the D. C. conductivity, ε0 the dielectric constant for vacuum, Δε the magnitude of dielectric dispersion and fmax the frequency at loss maximum.The Cole-Cole parameter β for representation of the distribution of dielectric relaxation times varies the range from 0.55 to 0.60, has an weak dependence on the composition of glass, and is independent of temperature.Both of these experimental results and the previously reported evidence for the low frequency dielectric relaxation in ionic conduction glasses lead to the conclusion that the nature of the low frequency dielectric relaxation in electronic conduction oxide glasses is identical with that in ionic conduction glasses.
社団法人日本セラミックス協会の論文
1968-03-01

電子伝導性酸化物ガラスの直流分極と誘電緩和

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