Abstract
The dispersion of γ-Al 2O 3 on dc ionic conductivity of a Frenkel type defect solid, Ba(NO 3) 2, showed an enhancement of ionic conductivity of nearly two orders of magnitude with respect to pure host material in the extrinsic region. This has been explained on the basis of the formation of large number of grain boundaries and also attributed to formation of space charge layers between host ionic material and insulating particles. The activation energy in the extrinsic motion region was found to decrease due to the formation of vacancies in the space charge region, which is thought to be more probable than the formation of interstitials.
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