The thermal conductivity of V3Si single crystals is measured within the temperature range from 0.1 to 300 K. In the temperature range above 100 K the thermal conductivity increases with increasing temperature. This behaviour is related to the deviation from linearity of the electrical resistivity at high temperatures common to A15 superconductors. At the temperature of the lattice transformation a change of both the electron—phonon scattering coefficient and the electrondefect scattering coefficient is found. In the superconducting state, the electron conductivity steeples decreases with decreasing temperature. From a fit of the measuring points to theoretical estimations the energy gap can be determined. At the lowest investigated temperatures the lattice thermal conductivity is dominating. The different scattering mechanisnis determining the temperature dependence of lattice thermal conductivity are discussed.
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