In the polycrystalline superconductor MgB2 the fraction of cross section that carries electrical current was previously shown to be obtained from the normal state electrical resistivity. The latest single crystal measurements show the thermal transport properties of MgB2 to be dominated by electrical transport. For the first time we apply the electrical cross section to the thermal conductivity of three polycrystalline samples with different grain size and porosity. It is found that the results can be readily discussed in the context of granular thermal–electrical properties consisting of common temperature dependent transport properties independent of grain size and porosity. The result gives an alternative interpretation to the temperature dependent thermal transport than given in previous publications
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