[en] Bulk and tape specimens of Nb₃Al have been fabricated by the powder metallurgy method between Nb₂Al and Nb. The microstructure and superconducting properties on the starting materials and the temperature of a heat treatment have been studied. X-ray diffraction analysis was carried out in order to identify the phases formed by the heat treatment. The A15 single phase, Nb₃Al, were formed at 1100degC for the bulk specimen prepared from the Nb₂Al/Nb mixed powders. The temperature of a heat treatment formed the A15 single phase prepared from the Nb₂Al/Nb was down 100-200degC in comparison to that prepared from the Nb/Al mixed powders. The highest critical temperature, Tc, obtained in the bulk specimens prepared from the Nb₂Al/Nb mixed powders is 16.0 K. (author)