Single crystals of have been grown by Czochralski techniques for and . Polycrystalline single‐phase material has also been pulled for . Two Czochralski techniques were employed: (i) the sealed system or Gremmelmaier technique, and (ii) the liquid encapsulation technique. Mass spectrographic data have been correlated with alloy lattice parameter determinations on the as‐grown material to yield information on the solidus curve of the system. Hall measurements were made and impurity analyses were performed using the spark source mass spectrometer.