  Thermal conductivity of superconducting MgB2 was studied in both the
superconducting and the normal state region. The latter is almost equally
determined by the electronic - and the lattice contribution to the total
thermal conductivity. In the superconducting state, however, the lattice
contribution is larger. The electronic thermal conductivity below Tc was
derived from the experimental data considering the Bardeen-Rickayzen-Tewordt
theory together with the model of Geilikman. The analysis shows that electron
scattering on static imperfections dominates.
