Lorenz number in relation to estimates based on the Seebeck coefficient

摘要: Abstract Separation of thermal conductivity (κ) into its electronic, lattice and other parts is great importance in understanding heat transport. Commonly, the Wiedemann–Franz relation used to obtain electronic based on electrical a Lorenz number that either set standard value for metals or using an approximate formula Seebeck coefficient. We Boltzmann transport theory test this realistic structures thermoelectrics different scattering regimes. find expression can give values differ infstantially from range doping levels important thermoelectrics. This happens materials with complex non-parabolic band structures, which are common high performance The results imply caution should be exercised use may have structures.