The electrical resistivity, thermal conductivity, and thermopower of α-TiAl alloy samples with Al content from 0 at.% to 10 at.% are measured from room temperature down to liquid helium temperature. It is found that with the increase in Al content the single phonon scattering contribution to the resistivity remains nearly constant, but the multiphonon scattering contribution monotonously increases. This provides an alternative explanation of resistivity saturation to the shunt-resistor model. The Wiedemann-Franz law holds for the whole temperature range, allowing the separation of the electron and phonon contributions to the thermal conductivity. The data from samples with different doping levels enable us to separate the band and the scattering terms in the thermopower.
- Electronic transport
- Resistivity saturation
- Separation of electron and phonon thermal conductivity