Comment on ’’A systematic experimental and theoretical investigation of the grain-boundary resistivities of n-doped BaTiO3 ceramics’’

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Abstract
In a recent paper Ihrig and Puschert reported on measurements of the current‐voltage characteristics and the temperature dependence of the effective zero resistivity of n‐type ceramic BaTiO3. They described their results using Heywang’s potential‐barrier model. In contradiction to other authors they denied a need to modify this model. It is shown here that the experimental results of Ihrig and Puschert are not detailed enough to warrant such a decision. The effect of an intergranular layer of a second phase on the grain‐boundary resistance of ceramic BaTiO3 is briefly discussed.