Abstract
AbstractThe effect of alumina admixtures on the ionic conductivity of TlCl is studied. In agreement with the model of “Heterogeneous Doping” a change of the intrinsic anionic conduction (Cl ‐vacancies) into a Tl+‐conduction (Tl+‐vacancies) is induced at lower temperatures (≦ 300 K). The experimental conductivity data as a function of temperature, concentration and grain‐size can be quantitatively described with an interface defect concentration considerably lower than for AgCl and AgBr. Likewise, for pure polycrystalline TlCl space charge regions enriched in cation vacancies around grain boundaries are assumed to provide an increase of the conductivity. Similarities and differences between heterogeneous and the classical homogeneous doping are clearly reflected by experiments using PbCl2 as a dopant for both TlCl and TlCl: Al2O3
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