Single crystal samples of lead telluride doped with Gd were grown using the Bridgman method. Far infrared reflectivity spectra in the temperature range from 10 K to 300 K were measured. The experimental diagrams were numerically analyzed using a fitting procedure based on the plasma-phonon interaction model and the optical parameters were determined, while two local modes of gadolinium were observed at about 155cm(-1) and 230cm(-1) at room temperature. The origin of these local vibrational impurity modes was discussed. (C) 2008 Elsevier B.V. All rights reserved.