Conduction of Sodium and Nonbridging Oxygen Ions in Sodium Silicate Glass

概要

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From thermally-stimulated polarization/depolarization current studies of bulk glasses of Na_2O-2SiO_2 and Na_2O-3SiO_2, the following conclusions were made. First, the great reduction of dc conductivity down to a few hundredths with decreasing sample thickness is explained in terms of the presence of inherent microheterogeneity in the glass structure. Second, the peak which previously was assigned generally as due to localized motion of non-bridging oxygen ions in the alkali-depleted region near the anode is better assigned as due to conduction polarization of those tons. Then the activation energy for conduction of non-bridging oxygen tons is estimated to be roughly 6±2 kcal/mole more than that for alkali conduction. And third, because of the high conductivity of bulk samples, degradation of alkali conduction by space charges accumulating near the electrodes during polarization generates the peak at around 10^<-8>-10<-7>Ω^<-1> cm^<-1>.
社団法人応用物理学会の論文
1983-02-20