Far infrared reflectivity spectra of single crystal PbTe samples doped with Ni (PbTe(Ni)) were measured in the temperature range between 10 K and 300 K. The reflectivity spectra were numerically analyzed using the Kramers Kronig method and a fitting procedure based on the plasmon-phonon interaction model, and the optical parameters were determined. The Hall parameters were measured at 300 K and 77 K and the obtained results were compared with the optical data. (c) 2005 Elsevier Ltd. All rights reserved.